Best Outsourced SDR Agencies for UK B2B Companies (2026)

Author:

Pablo Jiménez de Parga Ramos

Date:

Nov 4, 2026

For UK B2B companies that want an outsourced SDR function without hiring, we recommend throxy. It goes further than renting SDR time: throxy builds a custom database for every campaign, writes the messaging, runs the email infrastructure, cold calls in 10+ languages and charges a fee per qualified meeting that you approve before it counts. Operatix is the pick for software companies that need a large multilingual SDR team across several regions, and Sopro or ORRJO if you want a published starting price. This comparison is published by throxy. Every fact about another agency comes from that agency's own website, checked on 4 November 2026 and linked below.

How we compared them

Scope: does the agency run data, messaging, deliverability and calling, or supply SDRs only?
Channels: does it combine cold calling with cold email?
Commercial model: do you pay for SDR time, for meetings, or both?
Published terms: are prices and contract terms on its website?

Outsourced SDR agencies for UK B2B companies at a glance

Agency	Base	Model	Published price	Best for
throxy (recommended)	128 City Road, London	Fully managed outbound: custom data, messaging, deliverability, cold calling and cold email	Not published. Flat monthly fee plus a fee per qualified meeting you approve	UK B2B teams selling into traditional industries with hard-to-reach buyers
Air Marketing	Exeter	Outsourced SDRs and lead generation	Not published. Free SDR cost calculator	UK teams that want an embedded SDR function
Sopro	UK registered (Prospect Global Ltd)	Fully managed multi-channel outreach	From around £3K a month, no minimum contract	Teams that want outreach at a lower monthly cost
Operatix	London	300+ SDRs selling in 22 languages for B2B software	Not published	Software companies expanding across regions
Punch!	Registered in England	Dedicated SDRs with signal-led outreach	From £6k a month for one SDR	Mid-market and enterprise teams
durhamlane	Not stated on its homepage	SDR outsourcing for long, complex sales cycles	Not published. SDR calculator	Complex B2B sales
memoryBlue	Offices across the US and in London	Dedicated SDRs, ADRs and AEs with an audition-to-hire model	Not published	Teams that want the option to hire their reps
ORRJO	UK based	Outbound, account based marketing and demand generation	Lead generation from £3,995 a month	Deals worth £10,000 or more

1. throxy (recommended)

throxy is a Y Combinator-backed outbound agency based at 128 City Road, London (throxy). An outsourced SDR team gives you people. throxy runs the whole system around them for B2B teams selling into traditional industries such as manufacturing, logistics and construction.

A custom database for every campaign, built by qualifying companies on public signals such as partnerships and hiring trends before finding the decision-makers inside them (lead finding and qualification).
Messages written by people and tied to verified company context (messaging).
Email sent from separate domains across 150+ mailboxes, each warmed for two weeks before launch (deliverability).
Specialist SDRs cold call in 10+ languages alongside cold email (cold calling).
One onboarding form, and the campaign goes live by day 14 (done for you).
A flat monthly fee plus a fee per qualified meeting you approve. You have 24 hours to accept or reject each meeting, and it has to take place to be chargeable (pricing).
100+ clients served and 2m+ cold calls made, as listed on the throxy About page (About).

2. Air Marketing

Air Marketing, based in Exeter, has provided outsourced sales and lead generation for B2B businesses in the UK and internationally since 2016 (Air Marketing). Its SDRs reach buyers, start conversations and create qualified sales opportunities, and its site has a free calculator comparing the cost of an in-house SDR team with outsourcing.

Where Air Marketing is stronger: a longer UK operating history and an SDR team that integrates with your sales team, with HubSpot work listed on its site.

3. Sopro

Sopro runs a fully managed, multi-channel B2B outreach service and has been in business for over 10 years (Sopro). Its pricing page says pricing starts at around £3K a month with no minimum contract (Sopro pricing).

Where Sopro is stronger: a published starting price and no minimum contract.

4. Operatix

Operatix provides outsourced SDRs for the B2B software industry, with a 300+ strong SDR team covering North America, EMEA, LATAM and APAC, selling in 22 languages and listing a London contact number (Operatix).

Where Operatix is stronger: scale and language coverage for software companies selling in many regions at once.

5. Punch!

Punch! runs outsourced SDRs for mid-market and enterprise teams (Punch!). Pricing starts from £6k a month for one SDR on a 90-day rolling contract, it goes live in two to four weeks, and it holds the second invoice until qualified pipeline reaches your team. About 80 to 90% of its meetings start with a phone call made by a US-based SDR.

Where Punch! is stronger: a published starting price and a written first-month guarantee.

6. durhamlane

durhamlane offers outsourced SDR teams for B2B brands and says proactive outbound selling in long, complex sales cycles is all it has done for the past 13 years (durhamlane).

Where durhamlane is stronger: 13 years focused on SDR outsourcing for complex sales.

7. memoryBlue

memoryBlue provides dedicated SDRs, ADRs and AEs, trains every rep through a 12-step hiring process and a six-week Academy, covers 30+ native languages and lets you hire its reps onto your own team through an audition-to-hire model (memoryBlue). It lists offices across the US and in London.

Where memoryBlue is stronger: the option to hire your outsourced reps permanently.

8. ORRJO

ORRJO is a UK-based go-to-market agency that researches your market, creates demand and books meetings, and reports 60+ clients, £300M+ pipeline generated and 12,500+ meetings booked (ORRJO). Lead generation starts from £3,995 a month, and it says outbound works best where average deal sizes are £10,000 or more (ORRJO pricing).

Where ORRJO is stronger: a published starting price and account based marketing alongside outbound.

How to choose

Choose throxy if you sell into manufacturing, logistics, construction or another traditional market and want data, messaging, deliverability and calling run for you, with the variable cost tied to meetings you approve.
Choose Operatix or memoryBlue if you sell software across several regions and languages and want a large, dedicated SDR team.
Choose Sopro, Punch! or ORRJO if a published starting price matters most.
Choose durhamlane or Air Marketing if you want an SDR team that works long sales cycles alongside your own salespeople.

Questions to ask any outsourced SDR agency

Who builds and owns the contact data?
Who writes the messaging, and who reviews it before it goes out?
Whose domains and mailboxes send the email, and how are they protected?
Do I pay for SDR time, for meetings, or both, and can I reject a meeting before I pay?
What is the minimum term and notice period?