Reviewed by a team that installs go-to-market systems for a living.
Pricing disclaimer: Competitor pricing cited in this article comes from publicly available sources (Clutch profiles, agency websites, G2 listings) as of October 2026. We do not estimate or guess pricing. Where pricing is not published, we state "Not public." Contact each agency directly for current quotes.
Key Takeaways
- The UK GTM market splits into three tiers. Enterprise ABM firms with 200+ staff. Specialist outbound and RevOps shops with 10-80 people. Solo consultants and fractional leaders. The right tier depends on your deal size, sales cycle, and what you need to own when the engagement ends.
- Evidence quality varies wildly. Some agencies publish named client results with attributed pipeline. Others rely on aggregated review scores. A few publish nothing verifiable at all. We grade every agency on the same scale, including ourselves.
- Delivery model matters more than channel mix. Whether an agency builds infrastructure you own or rents you access to theirs determines what happens when the contract ends. Most UK agencies operate on retainers. A handful build systems you keep.
- Advanced Client (our firm) is included in this list. We install build-to-own GTM systems (LinkedIn Ads, outbound RevOps, or both) as a $30K-$50K project over four months, with founder-led delivery. We have created 8 figures+ of pipeline across 30+ B2B brands. The same evidence standard applies to us.
- We recommend competitors over ourselves in at least four scenarios in this article. If you need enterprise ABM at scale, HubSpot RevOps, managed SDR teams, or B2B content and brand, other agencies on this list are better suited.
Disclosure
Advanced Client appears on this list at position #1. We are transparent about our editorial position. To counterbalance it, every agency receives identical structure and depth. We list real limitations for AC, including capacity constraints and pricing floors. We recommend competitors for specific use cases where they outperform us. Every fact attributed to a competitor comes from their public materials, Clutch profiles, or published case studies as of October 2026. Every AC metric comes from our verified canonical data set.
If you think we have got something wrong, email tom@advancedclient.io.
Methodology: How We Ranked These Agencies
We assessed each agency across six criteria. Each criterion carries equal weight in our editorial assessment.
Evaluation Criteria
- Delivery model: Does the agency build infrastructure the client owns, or does the client rent access to the agency's systems? Build-to-own scores higher because it creates compounding value after the engagement ends.
- Speed to pipeline: How quickly does the first real pipeline appear? Not "onboarding complete" or "strategy delivered," but actual meetings booked or opportunities created.
- Proof quality: We assign every agency a proof tier based on what is publicly verifiable. Named clients with attributed revenue rank highest. Aggregated review scores rank second. Self-reported claims without named clients rank lowest.
- Channel depth: Does the agency specialise in one motion and execute it well, or spread across many channels with thin expertise in each?
- Pricing transparency: Published pricing earns more credit than "book a call." Buyers deserve to know whether an agency is in their budget before a discovery meeting.
- Client fit clarity: Does the agency clearly define who they are for and who they are not for? The best agencies turn away bad-fit prospects.
A go-to-market agency is a firm that builds, operates, or optimises the systems a B2B company uses to generate pipeline and convert it into revenue, spanning outbound, paid media, RevOps, and sales process.
Proof Tier Definitions
| Tier | Definition | What it means |
|---|---|---|
| Tier 1 | G2/Clutch/review platform score of 4.5 or higher with 30+ reviews | Broad, verified buyer sentiment across many engagements |
| Tier 2 | Named client results with attributed metrics | Specific, verifiable outcomes but fewer independent reviews |
| Tier 3 | Self-reported claims, no named clients or independent reviews | Unverifiable. May still be accurate, but buyers cannot confirm |
Neither tier is inherently superior. Tier 1 shows consistency across many clients. Tier 2 shows depth of impact with specific clients. Every agency on this list achieved at least Tier 2.
Quick Comparison Table
| Rank | Agency | HQ | Best For | Focus | Pricing | Evidence Tier |
|---|---|---|---|---|---|---|
| 1 | Advanced Client | London | B2B companies ($1M+ revenue or venture-backed) needing owned GTM infrastructure | LinkedIn Ads, Outbound RevOps, GTM Sync | $30K-$50K project | Tier 2 (named clients, attributed revenue) |
| 2 | Sopro | Brighton | B2B companies needing managed, compliant outbound prospecting at scale | Email prospecting, multi-channel outbound | From ~£2,500/mo | Tier 1 (Trustpilot 4.5/5, 236+ reviews) |
| 3 | The Marketing Practice | Newbury/London | Enterprise tech brands needing global ABM and demand gen | ABM, demand gen, partner marketing, sales enablement | Not public | Tier 2 (named clients: O2, VMware, SAP) |
| 4 | Punch! | London | Mid-market and enterprise needing outsourced SDR + ABM | SDR-as-a-Service, ABM, intent data | Not public | Tier 2 (named clients: AWS, Intercom, Sage) |
| 5 | Gripped | London | B2B SaaS and tech (£2M-£50M ARR) needing demand gen | Inbound, paid media, content, SEO | £5K-£15K/mo retainer | Tier 1 (Clutch 4.9/5, 32 reviews) |
| 6 | Operatix | Fleet | B2B software vendors needing outsourced SDR teams globally | SDR outsourcing, outbound, pipeline acceleration | From ~£7,000/mo | Tier 2 (named clients: Airbnb, Qubole) |
| 7 | durhamlane | Newcastle | B2B companies with complex sales cycles needing full-funnel sales support | Inside sales, outbound, opportunity qualification | Not public | Tier 2 (named clients, Deloitte Fast 500 clients) |
| 8 | Six & Flow | Manchester | HubSpot-centric B2B teams needing RevOps and GTM integration | HubSpot RevOps, demand gen, data/tech | Not public | Tier 2 (named clients, Elite HubSpot Partner) |
| 9 | Velocity Partners | London | Enterprise tech brands needing B2B content and brand strategy | B2B content, positioning, brand, SEO | Not public | Tier 2 (named clients: Webhelp, Russell Reynolds) |
| 10 | SalesCaptain | London | B2B companies needing high-volume outbound appointment setting | Cold email, LinkedIn outreach, multi-channel | From ~£3,500/mo | Tier 1 (Clutch 4.8/5, 22 reviews) |
| 11 | Scaled | London | Agencies, SaaS, and service firms needing GTM strategy and fractional leadership | GTM consulting, fractional CMO/sales, investor advisory | From £1,600/mo | Tier 2 (named clients, exit track record) |
Agency Profiles
1. Advanced Client: Build-to-own GTM infrastructure for B2B companies
At a Glance
| Field | Value |
|---|---|
| Website | advancedclient.io |
| Founded | 2023 |
| HQ | London and Paris |
| Team size | Founder-led (2 principals) |
| Focus | LinkedIn Ads (ABM), Outbound RevOps (Clay-led), GTM Sync |
| Pricing | $30K-$50K per project, ~4 months |
| Evidence tier | Tier 2: named clients, attributed revenue, client quotes |
What They Do
Advanced Client installs AI-powered go-to-market systems inside B2B companies doing $1M+ in revenue, or venture-backed and building towards it. Founded by Tom Grainger (CEO) and Louis Young (COO), the firm runs three service lines: LinkedIn Ads (ABM), Outbound RevOps (Clay-led cold email), and GTM Sync (both combined).
The operating model is unusual for an agency. Tom and Louis lead every account directly. No account managers, no juniors running campaigns. They build inside the client's own tools (Clay, Attio, Instantly, HeyReach, Prospeo, Trigify, WhiteWhale), document every workflow, and transfer full ownership by day 120. First campaigns go live within two weeks. Pipeline typically appears within 30 days. By day 90, the system is running. By day 120, the client owns it outright: playbooks, automations, templates, domain infrastructure, the lot.
The signal approach is central. AC builds custom buying signals from analysis of closed-won/lost deals and sales call transcripts. These are not generic hiring or funding triggers. They are proprietary signals modelled on what actually predicts a deal closing for each specific client. WhiteWhale powers the custom signal models.
Evidence
- m3ter (Series A, acquired by Salesforce): $2.4M pipeline from outbound, $4.6M total pipeline, $447K closed-won revenue, 42 meetings booked, CPL reduced from $5,171 to $334, 4.71x ROAS across 312 named accounts. Quote: "Advanced Client didn't just run ads for us. They built the entire go-to-market system." John Griffin, CRO.
- Verifile: $312K revenue, 17 FTSE 100 meetings, system live in 28 days. Full stack: Clay, Instantly, Prospeo, Attio. Quote: "From cold to FTSE 100 in 90 days." Steven Davies.
- The Cosine: 145 calls booked, $500K-$850K retainer closed (largest in company history). Quote: "We just closed our biggest retainer ever." Matt Schroeder.
- RAIN Group: 12-week build, 7 tools installed, ~15 live custom buying signals, 100% client-owned. Quote: "Outstanding quality, tailored to our business." Jason Murray, CSO.
- Saulderson Media: Netflix project closed, $650K+ in contracts, subsequently acquired. Quote: "The pipeline this built was behind our acquisition." Suhit Amin.
- Studio X: $5.7M pipeline, 50+ opportunities, built from zero outbound.
- SmashCactus: $70K+ closed, 100+ calls, 21-day first ROI.
- KinCreative: Revenue growth from $21K to $82K per month (4x), $800K+ annualised.
Strengths
- Founder-led delivery on every account. No handoff to juniors.
- Build-to-own model: the client keeps everything when the project ends.
- Custom buying signal infrastructure, not generic intent data.
- Speed: first campaigns live within two weeks, pipeline within 30 days.
Considerations
- Capacity-constrained. Two founders running every account means limited slots.
- $30K minimum makes this inaccessible for pre-revenue startups.
- Not a full-service marketing agency. No content, no SEO, no brand design.
- Project-based: if you want a long-term managed service, this is the wrong model.
Pricing
$30K-$50K per project, approximately four months. Project-based, no retainer lock-in. Full system ownership by day 120.
Best for: B2B companies doing $1M+ revenue (or venture-backed) that want to own their pipeline infrastructure, not rent it.
2. Sopro: Managed outbound prospecting at scale
At a Glance
| Field | Value |
|---|---|
| Website | sopro.io |
| Founded | 2015 |
| HQ | Brighton, UK |
| Team size | 201-500 employees |
| Focus | B2B email prospecting, multi-channel outbound |
| Pricing | From ~£2,500-£3,500/month |
| Evidence tier | Tier 1: Trustpilot 4.5/5 across 236+ reviews |
What They Do
Sopro runs fully managed outbound prospecting campaigns for B2B companies across the UK and internationally. The service covers the entire outbound motion: data sourcing, contact verification (GDPR-compliant), email sequence writing, campaign execution, and reporting. Email is the primary channel, with LinkedIn and calling layered on top.
The model is managed service. Sopro owns the infrastructure and runs campaigns on behalf of clients. This means less operational overhead for the client, but also less ownership. When the engagement ends, the playbooks and systems stay with Sopro.
Sopro distinguishes itself through volume and compliance. With 200+ staff and a proprietary data engine, they can run campaigns across sectors and geographies at a scale that most boutique agencies cannot match. Their GDPR compliance positioning is strong, which matters for UK and European buyers.
Evidence
- University of Bolton: 300+ leads in six months, four new clients acquired.
- Worldwide Logistics: Freed the internal sales team from prospecting by outsourcing lead generation through Sopro.
- Social for Good: 18,000+ sends, response rate exceeding 2%.
- 60+ published case studies across sectors and company sizes on their website.
Strengths
- Scale: 200+ staff, 60+ published case studies, established since 2015.
- GDPR compliance built into the operating model. Strong for UK and European outbound.
- Volume capability: can run large campaigns across multiple verticals simultaneously.
- Trustpilot rating of 4.5/5 across 236+ reviews provides independent buyer signal.
Considerations
- Managed service model. The client does not own the infrastructure when the engagement ends.
- Email-first approach. If your ICP responds better to phone or LinkedIn, the primary channel may not fit.
- Scale can mean less personalisation per campaign compared to boutique agencies that run fewer accounts.
Pricing
From approximately £2,500-£3,500 per month depending on volume and targeting complexity.
Best for: B2B companies that want a reliable, compliant outbound engine running without building an internal team, and are comfortable with a managed service rather than build-to-own.
3. The Marketing Practice: Enterprise ABM and global demand generation
At a Glance
| Field | Value |
|---|---|
| Website | themarketingpractice.com |
| Founded | 2002 |
| HQ | Newbury, UK (offices in London, Seattle, Munich, Melbourne) |
| Team size | 400+ employees |
| Focus | ABM, demand generation, partner marketing, sales enablement |
| Pricing | Not public |
| Evidence tier | Tier 2: named enterprise clients with attributed pipeline |
What They Do
The Marketing Practice (TMP) is one of the largest independent B2B agencies in the world. They run ABM, demand generation, partner marketing, and sales enablement for enterprise technology clients. The agency grew through acquisitions of Kingpin, Omobono, and Brandkey, giving it deep capability across multiple B2B disciplines.
TMP operates at a different scale to most agencies on this list. With 400+ staff, global offices, and clients like Microsoft, Salesforce, and Adobe, this is an enterprise agency for enterprise buyers. Their proprietary Argus intelligence platform supports account selection, targeting, and measurement.
The agency runs ABM and demand gen as an operating model, not as one-off campaigns. For enterprise tech companies selling into complex buying committees across multiple regions, TMP brings a level of orchestration capability that smaller agencies cannot match.
Evidence
- O2 Business: £260M pipeline generated, £39M attributed revenue.
- Verizon: 22 target-account meetings secured through ABM programme.
- Thomson Reuters CoCounsel: $13M of pipeline attributed to go-to-market launch.
- Named clients include VMware, Salesforce, SAP, Microsoft, Adobe.
- 20+ years of continuous operation.
Strengths
- Scale and track record: 400+ staff, 20+ years, named enterprise clients.
- Global delivery capability across EMEA, North America, and APAC.
- Multi-discipline: ABM, demand gen, partner marketing, and sales enablement under one roof.
- Proprietary Argus platform for intelligence and measurement.
Considerations
- Enterprise-focused. Not suited for startups, early-stage companies, or deals below six figures.
- Pricing is not public. Expect significant investment appropriate for enterprise marketing budgets.
- Large agency structure means account management layers between leadership and execution.
Pricing
Not public. Contact for pricing. Given the agency's enterprise positioning and team size, expect investment levels appropriate for complex, multi-region B2B marketing programmes.
Best for: Enterprise tech companies (think Microsoft, SAP tier) running multi-region ABM and demand gen programmes with dedicated marketing teams and six-figure agency budgets.
4. Punch!: Outsourced SDR teams with ABM and intent data
At a Glance
| Field | Value |
|---|---|
| Website | punchb2b.com |
| Founded | 2014 |
| HQ | London (offices in Dubai, Miami, New York, Johannesburg) |
| Team size | ~84 employees |
| Focus | SDR-as-a-Service, ABM-as-a-Service, intent-driven outbound |
| Pricing | Not public |
| Evidence tier | Tier 2: named clients with attributed pipeline |
What They Do
Punch! is a B2B sales development agency that structures its services around three core pillars: Priority Intent (using intent data and sales signals to identify ready-to-buy accounts), SDR-as-a-Service (outsourced SDR teams running multi-channel outbound), and ABM-as-a-Service (account-based marketing programmes for named accounts).
SDR teams run outreach across phone, email, LinkedIn, and targeted gifts through their Barney gifting platform. The agency assigns dedicated SDRs to each account, and those SDRs can join sales calls and help move opportunities to close. This is deeper involvement than most lead generation agencies offer. Most stop at the meeting booked. Punch! continues into the deal cycle.
Their client roster includes enterprise brands: AWS, Palo Alto Networks, Intercom, Sage, Square, and DHL. The agency reports £700M+ in total client pipeline generated, though this is an aggregated figure across all engagements.
Evidence
- Nutritics: 200+ high-value leads, £320,000 in pipeline revenue in 7 months.
- Basware: £760,000 pipeline in 3 months with 1,077% ROI.
- Ephesus: $41M in pipeline in one year, 75% increase in average deal size.
- Lumi: 56 sales opportunities in 4 months, 200+ meetings booked across five markets.
- Named clients include AWS, Palo Alto Networks, Intercom, Sage, Square, DHL.
- Self-reported: £700M+ total pipeline generated, average 6-12x ROI.
Strengths
- SDR teams that work beyond the first meeting. They support deal progression, not just appointment setting.
- Intent data layer (Priority Intent) identifies accounts with active buying signals before outreach.
- Global reach: offices in London, Dubai, Miami, New York, and Johannesburg.
- Strong enterprise client roster provides social proof for larger buyers.
Considerations
- Pricing is not public, which makes budgeting difficult before a discovery call.
- Managed SDR model. The client does not build internal SDR capability through this engagement.
- The £700M pipeline figure is aggregated and self-reported. Individual results will vary.
Pricing
Not public. Contact for pricing. Given the enterprise client base and team size, expect investment levels above basic lead generation services.
Best for: Mid-market and enterprise B2B companies that want outsourced SDR teams running intent-driven outbound, with support beyond the first meeting and into deal progression.
5. Gripped: Demand generation for B2B SaaS and tech
At a Glance
| Field | Value |
|---|---|
| Website | gripped.io |
| Founded | 2017 |
| HQ | London |
| Team size | ~34 employees |
| Focus | B2B SaaS demand gen: inbound, paid media, content, SEO |
| Pricing | £5,000-£15,000/month retainer (most clients £8K-£12K) |
| Evidence tier | Tier 1: Clutch 4.9/5 across 32 reviews |
What They Do
Gripped is a London-based B2B marketing agency that works exclusively with SaaS, AI, and tech companies doing £2M-£50M ARR. They run demand generation programmes across inbound marketing, paid media, content marketing, and SEO. The agency positions itself as a growth partner for SaaS founders who have product-market fit but need to scale pipeline.
The model is a monthly retainer. Gripped assigns a team of 2-10 people depending on the scope, covering strategy, content creation, paid media management, SEO, and reporting. The engagement is managed service: Gripped runs the campaigns, and clients get results plus reporting.
Gripped's strength is SaaS-specific positioning. They only work with B2B tech companies. This means their playbooks, benchmarks, and channel expertise are calibrated to SaaS buying cycles, not diluted across B2C or ecommerce.
Evidence
- Crownpeak: £1.3M of new pipeline in a single quarter.
- Eficode: 252% increase in opportunity value from search ads.
- 1567% increase in traffic and 4300% increase in lead flow reported for unnamed SaaS clients.
- Client testimonial: £20,000 investment yielding £2M returns.
- 160+ SaaS, AI, and tech clients served.
- Clutch rating: 4.9/5 across 32 reviews.
Strengths
- SaaS-only positioning. Every playbook and benchmark is calibrated to B2B tech.
- Transparent pricing published on their website and review profiles.
- Strong Clutch rating (4.9/5) provides independent buyer signal.
- Covers the full inbound motion: content, SEO, paid media, conversion.
Considerations
- Retainer model. Ongoing monthly commitment, not a project with a defined end date.
- Primarily inbound and demand gen. Not an outbound agency. If you need cold email or SDR teams, look elsewhere.
- Best suited for companies with £2M+ ARR. Pre-revenue startups may not get the same value.
Pricing
£5,000-£15,000 per month retainer. Most clients sit between £8,000 and £12,000. Minimum project size of $5,000+. Hourly rates of $100-$149.
Best for: B2B SaaS and tech companies (£2M-£50M ARR) that need a dedicated demand gen partner across inbound, content, paid media, and SEO.
6. Operatix: Outsourced SDR teams for B2B software vendors
At a Glance
| Field | Value |
|---|---|
| Website | operatix.net |
| Founded | 2012 |
| HQ | Fleet, Hampshire, UK (offices in Dallas, San Jose, Singapore) |
| Team size | 300+ employees |
| Focus | Outsourced SDR teams, pipeline acceleration, account-based selling |
| Pricing | From ~£7,000/month |
| Evidence tier | Tier 2: named clients with attributed results |
What They Do
Operatix is a specialist SDR outsourcing firm focused exclusively on B2B software and SaaS vendors. They build and manage dedicated SDR teams that operate as an extension of the client's sales function. The focus is outbound prospecting, inbound lead qualification, and account-based selling.
The agency runs campaigns across North America, EMEA, LATAM, and APAC in over 20 languages. With 300+ staff, Operatix supports programmes at a scale that most UK agencies cannot reach. Since July 2023, Operatix operates under memoryBlue, strengthening its North American delivery capability.
Operatix's differentiator is vertical specialisation. They work exclusively with B2B software vendors across cybersecurity, big data and analytics, infrastructure, MarTech, FinTech, cloud, DevOps, and IoT. This vertical focus means SDRs understand the technical language and buying process of software buyers.
Evidence
- Airbnb: Assisted with a global SDR project, achieving 106% of goal.
- Qubole: SDR programme supporting EMEA market expansion for the Big Data vendor.
- APImetrics: SDR team responsible for closing one of their biggest deals.
- Asimily: Pipeline acceleration across Middle East and EMEA with local language capabilities.
- Supported 21 vendors in the Deloitte Technology Fast 500.
- Self-reported: $50M+ in pipeline generated in the last year. 73% of clients see positive ROI within 60 days.
Strengths
- B2B software specialist. SDRs understand technical buying cycles.
- Global scale: 300+ staff, 20+ languages, offices across four continents.
- Named enterprise clients (Airbnb, Google, Adobe, Microsoft, Oracle).
- 73% of clients report positive ROI within 60 days.
Considerations
- Pricing starts from ~£7,000/month. Not suited for early-stage companies with limited budgets.
- Outsourced SDR model. The client does not build internal SDR capability.
- Acquisition by memoryBlue may affect operational independence and delivery culture.
Pricing
Retainers from approximately £7,000 per month. Custom pricing based on scope, resources required, sales cycle length, and average deal value.
Best for: B2B software and SaaS vendors that need outsourced SDR teams running outbound across multiple regions and languages, with vertical expertise in tech.
7. durhamlane: Full-funnel sales acceleration for complex deals
At a Glance
| Field | Value |
|---|---|
| Website | durhamlane.com |
| Founded | 2011 |
| HQ | Newcastle, UK |
| Team size | 100+ employees |
| Focus | Inside sales, outbound, opportunity qualification, sales methodology |
| Pricing | Not public (project-based) |
| Evidence tier | Tier 2: named clients, industry awards |
What They Do
durhamlane is a revenue acceleration firm that runs outbound campaigns, inside sales programmes, and full opportunity qualification for UK and international B2B clients. The key distinction: they work deals beyond the first meeting. Most lead generation agencies stop at the booked appointment. durhamlane's teams qualify opportunities, support proposals, and manage pipeline through to close.
The firm's proprietary "Selling at a Higher Level" methodology underpins all client programmes. This is not a generic sales framework. It is a trained, documented approach to complex B2B sales that durhamlane's teams execute on behalf of clients.
With 100+ staff and 13+ years of operation, durhamlane sits in the space between lead generation and full sales outsourcing. They are strongest for B2B technology, software, and professional services companies where sales cycles are long and buying committees are large.
Evidence
- Won the Global Sourcing Award (GSA) for Excellence in Partnership with Konica Minolta.
- Won the EngageB2B award for Best Use of Onboarding and Training.
- Named clients include global enterprise brands and mid-market companies across technology and professional services.
- 13+ years of continuous operation.
Strengths
- Full-funnel capability. They work beyond the first meeting, through qualification and into pipeline management.
- Proprietary "Selling at a Higher Level" methodology provides structured, repeatable sales process.
- 13+ years of track record in UK B2B sales.
- Strong for complex sales cycles with long timelines and multiple stakeholders.
Considerations
- Pricing is not public. Requires a discovery call to scope.
- Newcastle HQ may mean less London-centric networking, though this is increasingly irrelevant in remote delivery.
- Published case studies are less metric-specific than some competitors. Award wins demonstrate quality, but attributed pipeline numbers are harder to verify.
Pricing
Not public. Project-based pricing. Contact for quotes.
Best for: B2B technology and professional services companies with complex, multi-stakeholder sales cycles that need full-funnel sales support, not just meeting generation.
8. Six & Flow: HubSpot RevOps and GTM integration
At a Glance
| Field | Value |
|---|---|
| Website | sixandflow.com |
| Founded | 2015 |
| HQ | Manchester, UK (offices in London, Amsterdam, Dublin, Toronto) |
| Team size | ~32 employees |
| Focus | HubSpot RevOps, demand gen, data and technology, GTM strategy |
| Pricing | Not public |
| Evidence tier | Tier 2: named clients, Elite HubSpot Partner status |
What They Do
Six & Flow is an Elite HubSpot Solutions Partner and strategic GTM agency. Founded by Richard Wood in 2015, the agency specialises in RevOps consulting, HubSpot implementation, and data technology for mid-market B2B companies. Over 90% of their revenue comes from HubSpot clients, which tells you where the depth sits.
The agency operates at the intersection of GTM strategy and technical CRM implementation. They build unified revenue systems inside HubSpot: marketing automation, sales process, service pipelines, and reporting. For companies that have outgrown basic HubSpot usage and need proper RevOps architecture, Six & Flow has the technical depth.
Their international footprint (Manchester, London, Amsterdam, Dublin, Toronto) and ISO 27001:2022 certification make them strong for UK and EMEA companies where GDPR, data residency, and multi-language portals are first-class requirements.
Evidence
- The CFO Centre: Scaled global marketing operations with HubSpot, operating across multiple regions.
- 1,000+ successful HubSpot projects delivered.
- Elite HubSpot Solutions Partner (top tier of HubSpot's partner programme).
- ISO 27001:2022 certified for information security.
- 10+ years of continuous operation.
Strengths
- Elite HubSpot Partner. Top-tier certification with 1,000+ projects delivered.
- RevOps depth: they build proper revenue architecture, not just CRM setup.
- ISO 27001 certified. Strong for regulated industries and GDPR-conscious buyers.
- International delivery: five offices across UK, Europe, and North America.
Considerations
- HubSpot-centric. If you run Salesforce, Attio, or another CRM, this is not the right fit.
- Not an outbound or lead generation agency. They build the infrastructure, not the pipeline directly.
- Published case study metrics are limited. The 1,000+ project count demonstrates volume, but specific pipeline attribution is less visible.
Pricing
Not public. Contact for pricing.
Best for: HubSpot-centric B2B companies that need proper RevOps architecture, CRM implementation, and GTM integration with a certified partner.
9. Velocity Partners: B2B content and brand for technology companies
At a Glance
| Field | Value |
|---|---|
| Website | velocitypartners.com |
| Founded | 2000 |
| HQ | London |
| Team size | ~75 employees |
| Focus | B2B content marketing, positioning, brand strategy, SEO |
| Pricing | Not public |
| Evidence tier | Tier 2: named clients with attributed metrics |
What They Do
Velocity Partners is a London-based B2B marketing agency that combines positioning, brand strategy, and content marketing with a performance team. The agency works with enterprise technology clients globally, building content programmes designed to drive measurable pipeline for technology and SaaS companies.
Velocity Partners has been operating since 2000, making them one of the longest-running B2B content agencies in the UK. Their approach centres on "stories that survive an internal review process intact," meaning they build content strategies that are both creative and commercially defensible within large organisations.
The agency uses 9 custom metrics to measure how content and brand impact revenue, tying campaigns to KPIs including MQLs, SQLs, opportunities, and influenced revenue. Annual revenue of ~$19.4M makes them one of the larger independent B2B agencies in the UK.
Evidence
- Webhelp: 35% boost in website traffic.
- Russell Reynolds Associates: 8% increase in CTR.
- Calm Business: New brand positioning helped establish category leader status in the wellness market.
- Named clients include Canfor, InVision, Informatica, Epicor, Expedia, LeasePlan.
- 15 documented customer success stories.
- 24+ years of continuous operation.
Strengths
- Deep expertise in B2B content and brand for technology companies. 24+ years of track record.
- 9 custom metrics tying content to revenue. Not vanity metrics.
- Strong positioning capability. They help companies articulate what they do before building content.
- ~75 staff provides depth across strategy, creative, editorial, and performance.
Considerations
- Content and brand agency. Not an outbound, paid media, or RevOps firm. If you need pipeline fast, content takes time to compound.
- Pricing is not public. Enterprise positioning suggests investment levels above SMB budgets.
- Content marketing requires a longer time horizon to show pipeline results compared to outbound or paid.
Pricing
Not public. Contact for pricing. Given the team size (75) and annual revenue ($19.4M), expect enterprise-level investment.
Best for: Enterprise technology brands that need B2B content strategy, positioning, and brand programmes tied to pipeline metrics over a longer time horizon.
10. SalesCaptain: High-volume outbound appointment setting
At a Glance
| Field | Value |
|---|---|
| Website | salescaptain.io |
| Founded | 2021 |
| HQ | London |
| Team size | 100-249 employees |
| Focus | Cold email, LinkedIn outreach, multi-channel appointment setting |
| Pricing | From ~£3,500/month |
| Evidence tier | Tier 1: Clutch 4.8/5, 22 reviews |
What They Do
SalesCaptain is a B2B outbound sales agency that generates pipeline through cold email, LinkedIn outreach, and multi-channel campaigns. The agency focuses on appointment setting: identifying prospects, running outreach sequences, and booking qualified meetings on behalf of clients.
Despite being founded in 2021, SalesCaptain has scaled quickly to 100-249 employees and has worked with 50+ clients across 11 industries including B2B SaaS, construction, agencies, financial services, healthcare, and manufacturing. The agency uses buyer signals to time outreach, engaging accounts when they show signs of active buying.
Their Clutch profile shows strong client satisfaction, with pricing around £3,500 per month making them one of the more accessible outbound agencies on this list.
Evidence
- Curated Media: 391 positive replies, 156 booked appointments, 12 closed clients, $60K in new ARR.
- Global recruitment service: 501 booked appointments in 10 months, 715 positive replies, 57 new clients closed, $394K in new ARR.
- 50+ clients across 11 industries.
- Clutch rating: 4.8/5 across 22 reviews.
Strengths
- Transparent, accessible pricing from ~£3,500/month. Lower entry point than most agencies on this list.
- Strong appointment volume: case studies show 150-500+ meetings booked per engagement.
- Multi-industry experience across 11 verticals provides cross-sector playbook depth.
- Clutch rating of 4.8/5 provides independent buyer signal.
Considerations
- Founded in 2021. Less track record than established agencies like Sopro (2015) or durhamlane (2011).
- High-volume outbound can prioritise quantity over quality. Verify meeting qualification criteria before signing.
- Managed service. The client does not own the outbound infrastructure when the engagement ends.
Pricing
From approximately £3,500 per month. Minimum project size of $5,000+. Hourly rates of $200-$300.
Best for: B2B companies across multiple industries that need high-volume outbound appointment setting at an accessible price point.
11. Scaled: GTM strategy consulting and fractional leadership
At a Glance
| Field | Value |
|---|---|
| Website | scaled.co.uk |
| Founded | N/A (founded by multi-exit entrepreneur Simon Penson) |
| HQ | London |
| Team size | Boutique consultancy (senior partners + associates) |
| Focus | GTM strategy, fractional CMO/sales, growth consulting, investor advisory |
| Pricing | From £1,600/month (consultancy); £2,500 for growth audit |
| Evidence tier | Tier 2: named clients, documented exit track record |
What They Do
Scaled is a B2B growth consultancy that helps agencies, SaaS companies, and service firms find product-market fit faster with a proven 10-step GTM framework. The firm was built by Simon Penson, who has exited two digital businesses, the second being a 280-person agency in a deal worth north of £35M.
The model is consulting and fractional leadership, not managed service. Scaled provides GTM strategy, fractional CMO and sales director roles, growth audits, and investor advisory. They also work with private equity and VC firms to help scale portfolio companies.
Scaled's strength is first-hand founder experience. Simon and Senior Partner Richard Marriott bring documented exit experience, which means their GTM advice comes from people who have built and sold businesses, not just marketed for them.
The agency is best known for scaling agencies globally, but also works across SaaS verticals including adtech, healthtech, salestech, edtech, applied AI, HRtech, and crypto.
Evidence
- Saulderson: Year-on-year growth outstripping all forecasts at almost 100% after engaging Scaled.
- Kaizen: 6x EBITDA growth over three years, supported through hiring a new CEO, transitioning from founder-led sales to scale-up sales motion, and organisational design.
- Client testimonial: "Scaled played a significant part in the trebling of our top line revenues."
- Founder Simon Penson's personal exit track record: two businesses sold, second at £35M+.
- Works with PE and VC firms to scale portfolio companies.
Strengths
- Founded by someone who has actually built and sold businesses. Not theory.
- Most accessible pricing on this list: from £1,600/month.
- GTM framework (10-step process) provides structured, repeatable approach.
- PE/VC advisory capability for portfolio company acceleration.
Considerations
- Consulting, not execution. Scaled advises on GTM strategy but does not run campaigns, build outbound systems, or manage paid media.
- Best suited for companies that have internal teams to execute the strategy Scaled designs.
- Smaller team means capacity is limited for large-scale engagements.
Pricing
Core consultancy from £1,600 per month. Growth audit/plateau diagnosis: £2,500. Pricing varies depending on stage of business, time commitment, and whether there is an investment involved.
Best for: Agencies, SaaS companies, and service firms that need GTM strategy and fractional leadership from people with documented exit experience.
Practitioner's Perspective: What We Have Learned Working in This Market
We install GTM systems for B2B companies. That means we see the aftermath of other agency engagements regularly. Clients come to us after spending six months with an agency that generated reports but no pipeline, or after an outbound firm booked 50 meetings that produced zero revenue.
Here is what we have observed working in the UK GTM market since 2023.
The managed service trap is real. Most UK agencies operate on retainers. The client pays monthly, the agency runs campaigns, and when the contract ends, the client has nothing. No playbooks, no automations, no domain infrastructure. They are back to zero. Before signing a retainer, ask one question: "What do I own when this ends?" If the answer is "the results we generated," that is a managed service. If the answer is "the full system, documented and transferred," that is a build.
Enterprise ABM and startup outbound are different sports. We have seen founders hire enterprise ABM agencies because the case studies looked impressive. A firm that generates £260M in pipeline for O2 Business operates at a completely different scale, budget, and timeline than what a Series A SaaS company needs. Match the agency to your stage, not to their biggest logo.
"Leads" is not a useful metric. The UK market is full of agencies that promise leads. The word means nothing without qualification criteria. A lead could be someone who downloaded a whitepaper, someone who replied "not interested" to a cold email, or someone who booked a meeting and showed up ready to buy. We measure pipeline (attributed revenue in a CRM) and closed-won revenue. Everything else is noise.
Outbound without signals is spam at scale. We have seen UK agencies running 10,000 cold emails per week with no targeting beyond job title and company size. This worked in 2021. In 2026, with AI spam filters, stricter deliverability rules, and buyers who receive 30+ cold emails daily, undifferentiated outbound is a race to the bottom. The agencies producing real results are using custom buying signals to identify accounts that are actually likely to buy.
The best agencies are honest about who they are not for. Every agency on this list has a sweet spot. TMP is brilliant for enterprise ABM. Sopro is strong for managed outbound at scale. Gripped is excellent for SaaS demand gen. None of them are good at everything. The worst buying decision you can make is choosing an agency because they said yes to every requirement. The best agencies say "that is not what we do, but here is who does it well."
Decision Matrix: Which Agency for Which Problem?
| Your Problem | Best Agency | Why |
|---|---|---|
| "We need to own our GTM infrastructure, not rent it" | Advanced Client | Build-to-own model with full handover by day 120 |
| "We need managed outbound at scale, GDPR-compliant" | Sopro | 200+ staff, GDPR-native, 60+ published case studies |
| "We are an enterprise tech brand running global ABM" | The Marketing Practice | 400+ staff, named enterprise clients, multi-region capability |
| "We need outsourced SDR teams that work deals, not just book meetings" | Punch! | SDRs support deal progression, not just appointment setting |
| "We are a SaaS company (£2M-£50M ARR) needing demand gen" | Gripped | SaaS-only positioning, transparent pricing, Clutch 4.9/5 |
| "We need SDR teams for B2B software across multiple regions" | Operatix | 300+ staff, 20+ languages, B2B software vertical specialist |
| "We have complex sales cycles and need full-funnel sales support" | durhamlane | Full-funnel capability beyond meeting generation, proprietary methodology |
| "We run HubSpot and need proper RevOps architecture" | Six & Flow | Elite HubSpot Partner, 1,000+ projects, ISO 27001 certified |
| "We need B2B content and brand strategy tied to pipeline" | Velocity Partners | 24+ years, 9 custom revenue metrics, enterprise tech focus |
| "We need high-volume outbound on an accessible budget" | SalesCaptain | From ~£3,500/month, 100-500+ meetings per engagement |
| "We need GTM strategy from someone who has actually built and sold businesses" | Scaled | Founder with £35M+ exit, from £1,600/month, PE/VC advisory |
5-Step Framework for Choosing a UK GTM Agency
Step 1: Define what you need to own
Before talking to any agency, answer this: when the engagement ends, what needs to stay with you? If the answer is "everything: playbooks, automations, domain infrastructure, signal models," you need a build-to-own agency. If the answer is "just the pipeline they generated," a managed service works fine.
Step 2: Match your stage to the agency's sweet spot
A pre-revenue startup should not hire The Marketing Practice. An enterprise tech company should not hire SalesCaptain. Every agency on this list has a stage-fit. Ask about their typical client size, average deal value, and sales cycle length. If you are an outlier in their portfolio, you will get an outlier result.
Step 3: Verify evidence, not promises
Ask for three named clients you can reference-check. Not testimonials on a website. Actual humans you can call or email. Any agency that cannot provide this after 2+ years of operation is either too new to have a track record or too embarrassed to share one.
Step 4: Understand the pricing model
Monthly retainer, project-based, or performance-based? Each has trade-offs. Retainers provide stability but lock you in. Projects provide clear scope but end. Performance-based sounds attractive but often comes with volume metrics (meetings booked) rather than quality metrics (pipeline created). Know what you are paying for before you sign.
Step 5: Run a 90-day test with a single motion
Do not sign a 12-month contract for full-service marketing on day one. Pick one motion: outbound, LinkedIn Ads, or content. Run it for 90 days. Measure pipeline, not leads. If the motion works, expand. If it does not, you have lost three months, not twelve.
FAQ
What is a GTM agency?
A go-to-market agency is a firm that builds, operates, or optimises the systems a B2B company uses to generate pipeline and convert it into revenue. This spans outbound sales development, paid media, RevOps infrastructure, content marketing, and sales process. The term "GTM" distinguishes these agencies from traditional marketing agencies that focus on brand awareness rather than pipeline creation.
How much does a UK GTM agency cost?
Costs range from £1,600 per month (strategy consulting with Scaled) to enterprise budgets with The Marketing Practice. Most agencies on this list sit between £3,500 and £15,000 per month for managed services. Project-based agencies like Advanced Client charge $30K-$50K for a complete build over four months. The right budget depends on your stage, deal size, and whether you need managed service or build-to-own.
What is the difference between a GTM agency and a marketing agency?
A marketing agency typically focuses on brand awareness, content creation, and demand generation across broad channels. A GTM agency focuses specifically on pipeline: the systems, processes, and infrastructure that turn named accounts into meetings and revenue. GTM agencies tend to work closer to sales teams and measure success in pipeline and closed-won revenue, not impressions or MQLs.
Should I choose a managed service or a build-to-own model?
Managed service works if you want ongoing pipeline without building internal capability. The agency runs everything. Build-to-own works if you want to own the infrastructure and eventually run it with internal teams. The trade-off is speed versus independence. Managed services produce results faster because the agency has done it before. Build-to-own takes longer upfront but compounds because you own the system.
How do I know if a GTM agency is right for my stage?
Ask three questions: What is your typical client's ARR? What is the average deal size you optimise for? What is your shortest and longest engagement? If your company is a $500K ARR startup and the agency's typical client is a $50M enterprise, you are not in their sweet spot. Stage-fit matters more than agency reputation.
What should I look for in GTM agency case studies?
Look for named clients (not "a leading SaaS company"), attributed metrics (pipeline or revenue, not leads or impressions), and a timeframe (results in 90 days, not "over the course of our engagement"). The best case studies include a quote from a named person at the client company. Aggregated claims like "£700M in total pipeline" are less useful because they cannot be verified for any individual engagement.
Can I use multiple GTM agencies at once?
Yes, but only if they cover different motions with clear boundaries. One agency for outbound and another for paid media can work if the CRM integration is clean and attribution is clear. Two agencies doing outbound will create overlap, deliverability issues, and confused prospects. Define lanes before stacking agencies.
Final Verdict
The UK has genuine depth in B2B GTM capability, from enterprise ABM firms with 400+ staff to specialist outbound shops that can spin up in weeks. The challenge is not finding an agency. The challenge is finding the right one for your stage, budget, and ownership requirements.
If you need to own your GTM infrastructure and want founder-led delivery, Advanced Client is built for that. If you need managed outbound at scale with GDPR compliance, Sopro has the track record. If you are an enterprise tech brand running global ABM, The Marketing Practice has 20+ years of proof. If you need HubSpot RevOps, Six & Flow is the certified specialist. If you need GTM strategy from someone who has built and sold businesses, Scaled brings first-hand experience at the most accessible price point on this list.
The worst decision is choosing an agency based on their website design or their biggest logo. Choose based on evidence, stage-fit, and what you own when the engagement ends.
Tom Grainger is CEO and Co-founder of Advanced Client. He installs AI-powered go-to-market systems for B2B companies doing $1M+ in revenue, or venture-backed and building towards it. Contact: tom@advancedclient.io.