Go-to-Market
Kayla Tait
November 11, 2026
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UK B2B sales teams sell into a smaller pool than the headline number suggests. Government figures count 5.7 million private sector businesses at the start of 2025, yet only 38,435 of them were medium-sized and 8,335 were large. If you sell to mid-market or enterprise accounts, every target counts, and a careless first contact can close a door for months.
Buyers are also harder to reach. Gartner's 2025 survey found 61% of B2B buyers prefer a rep-free buying experience. A good B2B lead generation agency handles this by doing the research, writing relevant messages and booking meetings only with buyers who fit your criteria.
The B2B lead generation agency options below differ in how they charge, which channels they lead with and how much of the work they own. Each entry states where the company is based, what it sells and who it suits. If you want a wider view beyond the UK, see our list of the best B2B lead generation agencies in 2026.
1. Whistle
Alt text: Whistle homepage, a B2B lead generation agency for tech and SaaS teams
Whistle is a fully remote B2B sales development company that books meetings for tech and SaaS teams. Over 350 companies trust Whistle, its SDRs book 14,000 meetings a year, and its programmes have generated over $1B in pipeline.
There are two ways to work with Whistle. Hire SDRs places a vetted sales development rep in your team. Whistle hires just 1 in every 500 candidates, its SDRs have 5+ years of sales experience on average, and you can be matched in as little as 24 hours and placed within 5 days. You manage the rep, on month-to-month contracts.
Outsourced SDR is the managed option. It brings an SDR team, a customer success manager, a team lead, messaging, multichannel sequences, contact data, a reporting dashboard and CRM support. The programme goes live in 10 business days, first meetings typically arrive two to three weeks after launch, and your sales team takes every meeting.
Services: SDRs available for hire, outsourced SDR programmes, B2B appointment setting, cold calling, cold email, LinkedIn outreach, contact data, RevOps for HubSpot.
Best for: B2B tech and SaaS teams that need either one experienced SDR or a full outbound function.
Pricing: Pricing depends on scope.
Alt text: Flowd homepage, a Manchester lead generation agency in the UK
Flowd is based in Manchester and started in 2021. It runs outbound email and SDR calling for B2B companies, with data, enrichment and deliverability handled in-house. Flowd says it goes from kick-off to first meeting in 14 days and works on a single retainer with a 30-day break clause, so you are not tied in if the programme does not suit you.
Services: Outbound email, SDR calling, GTM strategy, sales prospecting and data enrichment, deliverability.
Best for: SMEs and mid-market firms that want cold email plus SDR calling without a long commitment.
Pricing: Flowd's pricing page says programmes start from around £5,000 per month, with some clients spending as much as £30,000 per month.
Alt text: Sopro homepage, a Brighton B2B lead generation agency
Sopro was founded in 2015 and has its UK office on North Street in Brighton, with further offices in Miami and Skopje. Its lead generation service runs email-led prospecting with LinkedIn, IP retargeting, webchat and display ads, then passes interested prospects to your team. Sopro says campaigns go live in under three weeks.
Services: B2B lead generation, cold email outreach, multichannel campaigns, demand generation, account-based engagement, B2B appointment setting.
Best for: Teams that want a fully managed, email-led programme without building an in-house team.
Pricing: Bespoke pricing with no minimum contract, according to Sopro.
Alt text: durhamlane homepage, a Newcastle B2B lead generation agency
durhamlane is based at Generator Studios in Newcastle upon Tyne and says outsourced sales development is all it has done for the past 13 years. Its outbound sales development teams include native-language SDRs for the UK, Europe and North America. durhamlane says it can mobilise a fully managed team in around 30 days.
Services: Outbound sales development, inbound lead conversion, customer expansion, new customer acquisition, event sales support, sales audits.
Best for: Mid-market and enterprise firms with complex sales cycles across several regions.
Pricing: durhamlane says its average new customer typically invests £10,000 to £20,000 a month, split between a fixed fee and a success-based element.
Alt text: Air Marketing homepage, an Exeter B2B lead generation partner
Air Marketing has operated since 2016 from the Generator Hub at Kings Wharf in Exeter. Its lead generation service covers phone, email and social outreach, and it runs multilingual telemarketing and European outbound campaigns. It is also a HubSpot partner, which helps if your CRM runs on HubSpot.
Services: Outsourced SDRs, lead generation, inside sales, multilingual telemarketing, European outbound, event booking, sales process audits.
Best for: Scale-ups and SaaS firms that need outreach across several European markets from one UK partner.
Pricing: Not published. Air Marketing offers an in-house vs outsourced SDR cost calculator instead.
Alt text: Sentrama homepage, a Bristol B2B lead generation agency with per-lead pricing
Sentrama was founded in 2019 and is based at Temple Studios in Bristol. Its SDRs pitch prospects by phone and transcribe each call into your CRM, follow up SQLs to book meetings and send LinkedIn invitations to prospects who do not pick up. Sentrama says it has delivered more than 600,000 pitches and handed more than 96,000 SQLs to sales.
Services: SDR phone pitching, SQL follow-up and meeting booking, MQL handoff, LinkedIn outreach, pitch writing, campaign optimisation.
Best for: Teams that want phone-first outbound at a predictable price per conversation.
Pricing: Sentrama's pricing page charges per lead, defined as a prospect who picks up the phone. Tiers run from 50 leads at £70 each (£3,500 a month) to 200 leads at £40 each (£8,000 a month), with a four-month minimum term. Check whether VAT is included.
Alt text: Blueberry Marketing Solutions homepage, a Leeds telemarketing and lead generation agency
Blueberry Marketing Solutions describes itself as a UK B2B lead generation and telemarketing agency and has delivered campaigns since 2005. It is based at Consort House on South Parade in Leeds. Its lead generation service pairs data and audience profiling with telemarketing and appointment setting.
Services: Data and audience profiling, B2B telemarketing, appointment setting, lapsed customer re-engagement, event telemarketing, market research.
Best for: UK firms, including education and public-sector suppliers, that want phone-led appointment setting backed by data profiling.
Pricing: Not published. Custom quote based on scope.
Alt text: Achieve UK homepage, a Wokingham B2B lead generation agency
Achieve UK was established in 1998 and is based at Albany House on Shute End in Wokingham. It says it works exclusively with small, established businesses, and that its staff are experienced business professionals who do the work themselves. Its B2B lead generation service sits alongside outsourced SDR, telemarketing and appointment setting.
Services: SDR outsourcing, B2B telemarketing, B2B appointment setting, B2B lead generation, prospect nurturing, market research.
Best for: Established SMEs with complex or high-value offers that want senior callers from a small team.
Pricing: Not published. Custom quote based on scope.
Alt text: Punch! homepage, a London outsourced SDR and lead generation agency in the UK
Punch! is registered in England and lists teams in London, New York and Johannesburg. It combines human SDRs with buying-intent signals and outsourced ABM, so reps prioritise accounts that show buying activity. Punch! says its SDRs complete a six-week academy and receive weekly coaching. It offers 90-day terms and a 30-day refund guarantee.
Services: Human SDRs, AI-agent outreach, outsourced ABM, intent signals, cold calling, B2B appointment setting.
Best for: Mid-market and enterprise firms in SaaS, finance, healthcare and logistics that want SDRs combined with signal data.
Pricing: Punch! says clients invest "between 10K-40K monthly" without stating a currency. Confirm the currency and scope before you compare.
Alt text: The Telemarketing Company homepage, a Brighton lead generation agency in the UK
The Telemarketing Company has operated since 1990 from Regency Square in Brighton. Its lead generation service says it makes 60,000 calls on average per week with up to 230 agents, and offers native-language support in more than 25 languages. It suits volume calling more than account-based outbound.
Services: Lead generation, B2B appointment setting, cold calling, lead qualification and nurture, multilingual telemarketing, SDR outsourcing.
Best for: Larger programmes that need high calling capacity or calling in several languages.
Pricing: TTMC charges by the hour, not per lead. Rates not published.
A B2B lead generation agency finds accounts that fit your ICP, identifies the right buyer in each one and contacts them by phone, email and LinkedIn. When a prospect shows interest, the agency qualifies fit and need against your criteria. It then either passes the lead to your team or books a meeting with your AE.
The channel mix changes the numbers you should expect. The Bridge Group's 2025 research found phone-centric SDR teams make 56 dials a day and hold 4.6 quality conversations, against 28 dials and 3.4 conversations for email-centric teams. Ask any lead generation agency in the UK which channel it leads with and why it suits your buyers.
Some agencies stop at a list of interested contacts. Others run the whole outsourced SDR function, from data to booked meeting. Agree which one you are buying before you compare quotes.
Published figures on this list start at £3,500 for 50 phone leads and around £5,000 a month for an email-led programme. Managed outbound programmes with a fixed and success-based element run £10,000 to £20,000 a month. Most agencies quote to scope.
When you compare quotes, list what each one includes: data, sending tools, copywriting, calling, management, CRM updates and reporting. A cheaper quote that excludes data or management often costs more once you add those yourself. Ask for a sample weekly report and a named account manager before you sign, so you know exactly what you will see each week.
Yes, with conditions. The ICO's guidance on business-to-business marketing says the PECR consent rule for marketing emails does not apply to corporate subscribers, such as limited companies. It does apply to sole traders and some partnerships, so those contacts need consent or a soft opt-in.
For calls, screen numbers against the TPS and CTPS before dialling. UK GDPR still applies to personal data such as a named employee's work email, so the agency needs a lawful basis and a clear opt-out in every message. It should also keep one suppression list and honour opt-outs across every channel it uses for you. The ICO notes this guidance is under review. This section is general information, not legal advice, so check your own position with a qualified adviser.
Start with the gap you are filling. If your sales team has a playbook but no time, you need capacity. If you have never run outbound into your market, you need targeting and messaging help as well.
Agree company size, sector, buyer role, a stated need and agreement to talk. Decide how no-shows, reschedules and rejected leads count. Agree who in your team accepts or rejects each lead, and how quickly. Without this, you and the agency will disagree about what you paid for.
Ask for campaigns that reached the same buyer role, company size and deal size. An agency that books meetings with office managers may struggle with CFOs. Ask who will run your account and what they have sold before.
Some agencies lead with the phone, some with email and some combine phone, email and LinkedIn. Ask how they sequence channels and when they change approach if a channel underperforms.
Ask how the agency sources data, screens numbers against the TPS and CTPS, handles sole traders and records opt-outs. Ask whose domains it sends from and who owns them.
You need leads delivered, meetings booked, meetings held, acceptance by your sales team and opportunities created. Activity counts alone hide poor targeting. Our guide to the questions to ask an outsourced SDR company lists what to check before you sign.
Check minimum terms, notice periods, setup fees and pilot options. Minimums on this list range from a 30-day break clause to a four-month minimum term. Agree what happens to your data and lists if you leave.
Paying for volume without checking acceptance. A lead your sales team rejects still costs you. Track how many leads become held meetings.
Sending generic outreach to a small market. With only 46,770 medium and large businesses in the UK, poor messaging burns accounts you cannot easily replace.
Treating PECR as the agency's problem. Your brand carries the complaint. Ask for the agency's compliance process in writing.
Ignoring who owns the data and domains. Agree upfront what you keep when the contract ends.
Judging a programme in its first month. Data, messaging approval and ramp take time. Review results over the first full quarter.
Pay-per-lead works when your sale is simple and a short phone conversation is enough to qualify. It struggles when your deal involves several stakeholders, a long cycle or a technical buyer. In those cases an outsourced SDR who learns your product, follows up across channels and books a meeting with context tends to suit better.
A blended approach also works. Some teams use a pay-per-lead agency to test a new segment cheaply, then move the segments that convert to a dedicated SDR who can work those accounts in depth. Whichever route you take, judge the B2B lead generation agency on meetings held and opportunities created.
For a UK view of meeting-focused providers, see our list of the top B2B appointment setting services in the UK. If you are weighing partners across Europe, our guide to sales outsourcing companies in Europe compares the main options.
Whistle books meetings for B2B tech and SaaS teams. If you already run outbound and need another experienced rep, SDRs available for hire can be matched in as little as 24 hours and placed within 5 days, on month-to-month contracts.
If you want the whole function run for you, our outsourced SDRs go live in 10 business days, with first meetings typically two to three weeks after launch. Whistle handles data, messaging, outreach and reporting. Your sales team takes every meeting and keeps the closing.
Book a meeting with Whistle to talk through your ICP, target accounts and the meeting volume your team can handle.
Outsourced SDR
Whistle installs a fully managed SDR team - outreach, tech, data and reporting all handled - so qualified meetings land on your calendar instead of your to-do list. Live in 10 business days.
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