Roundup
Outsourced SDR agencies in the UK, 2026.
Thirteen providers that run outsourced sales development for UK B2B companies, described by what each actually does rather than ranked. We are one of them, and we say so. Use the questions at the end on all of them, us included.
Disclosure: Caption is an outsourced SDR provider and appears on this list. The other entries are described from their own websites, read in September 2026, without ranking and without comment on quality. If we have described your company wrongly, email info@caption-group.com and we will fix it.
An outsourced SDR agency employs, trains and manages sales development reps who prospect your market under your name and hand qualified meetings to your closers. The providers below all do some version of that for UK companies. They differ in what leads - the phone, email or LinkedIn - in whether a manager sits over the calls, in how much of the stack they bring, and in whether they publish a price. Those differences matter more than the order they appear in.
How this list was made
We read each provider’s site and the UK roundups the answer engines draw on, and kept the ones that describe themselves as running outsourced SDR, sales development, appointment setting or outbound for UK B2B companies. Directories, software vendors and pay-per-lead marketplaces are left out. Alphabetical, after us.
The providers
Caption (caption.wtf)
Plug in and play sales development. Outsourced SDRs prospecting under the client’s name across phone, email and LinkedIn, a manager on every rep’s calls, and the data, dialler and sequencing on Setta, our own platform. UK B2B markets; incorporated in Hong Kong. No published price; the board is built and shown before the client commits. Case studies with client quotes on this site.
Air Marketing (air-marketing.co.uk)
Exeter-based outsourced sales and lead generation, with outsourced SDRs, telemarketing, inbound and event booking. Publishes an in-house versus outsourced cost calculator and cost guides.
Belkins (belkins.io)
International appointment-setting and lead generation agency with a UK client base and a UK roundup of its own. Named service tiers without figures; publishes original cold-email data.
Curral (curral.london)
City of London outsourced sales development: outsourced SDR teams and appointment setting for B2B companies.
durhamlane (durhamlane.com)
SDR outsourcing and inside sales from the north-east of England, with sector pages, an SDR cost calculator and a homepage FAQ. Hosts its own UK sales outsourcing roundup.
EngageTech (engagetech.io)
Outsourced, augmented and managed SDR teams for enterprise B2B technology companies, with a benchmarking calculator.
memoryBlue (memoryblue.com)
US-founded SDR services company with a UK office in Fleet, which acquired Operatix in 2023. SDR services, an academy and a cost calculator.
Operatix (operatix.net)
London-headquartered outsourced sales development for B2B software vendors - outbound, inbound qualification and channel programmes - with offices in the US and Singapore. Part of memoryBlue since 2023.
ORRJO (orrjo.com)
London research-led lead generation and outsourced SDR services, with published from-prices, cost guides and its own State of B2B Outbound report.
Punch! (punchb2b.com)
London and Miami B2B sales agency: SDR as a service, appointment setting and outbound for mid-market and enterprise, with hiring and ROI calculators and a homepage FAQ.
SalesCaptain (salescaptain.io)
London outbound and go-to-market agency with free tools (cold email generator, spam checker) and programmatic directories of agencies by city and country.
Sopro (sopro.io)
Multichannel prospecting service, email-led, with service and industry pages, an annual State of Prospecting report and a starting figure on its pricing page.
The Lead Generation Company (theleadgenerationcompany.co.uk)
Phone-first B2B lead generation, telemarketing and appointment setting, with a UK appointment-setting roundup of its own.
What to ask all of them
The full twelve questions are in this post. The four that separate providers quickest: who listens to the calls and how often; can we see the board before we sign; what happens in the third week of calling, when nobody has replied yet; and what is a meeting - booked, or held with a person who fits criteria agreed in writing.
Why is Caption first?
Because it is our site. The rest are alphabetical. We would rather say that plainly than pretend the order means something.
Why are there no prices?
Some of these providers publish one and some do not; we do not. Where a provider publishes a price it is on their site, which is the right place to read it.
Why are there no ratings?
We have not used the others, so we cannot rate them honestly. The descriptions are what their own sites say they do.
How often is this updated?
Each January, and when a provider asks us to correct an entry. Last checked September 2026.
Fifteen minutes. No pitch.
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