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Company lists · Data refreshed September 2026

Top 25 Outbound sales agencies based in the United Kingdom

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 1,001 companies tracked

RevenueBase identified 1,001 outbound sales agencies headquartered in the United Kingdom as of September 2026 and tracks 8,406 professional contacts across them, including 1,558 with verified work emails and 453 with mobile numbers. London is the largest hub.

This list covers outbound sales agencies headquartered in the United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review
1,001Companies
8,406Contacts tracked
1,558Verified emails
453Mobile numbers
Unlock all 1,001 companies Free signup · no credit card · 500 free credits

The 25 largest outbound sales agencies based in the United Kingdom

Ranked by team size
Top 25 of 1,001 outbound sales agencies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names outbound sales agencies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
MVFIndirect evidence
London, United KingdomHQ checked Sep 3, 2026201-500417

“MVF powers growth for our clients by connecting them to potential customers.”

Source: company website · checked Sep 3, 2026
2
The Telemarketing CompanyPartial evidence
Brighton, United KingdomHQ checked Sep 3, 2026201-500242

“The Telemarketing Company is one of the UK's most trusted telemarketing agencies, delivering flexible, high-quality voice services, including pre and post sales research…”

Source: company website · checked Sep 3, 2026
3
AIR MarketingPartial evidence
Exeter, United KingdomHQ checked Sep 3, 202651-200123

“Since 2016, Air Marketing has been the trusted outsourced sales and lead generation agency in the UK for ambitious B2B businesses.”

Source: company website · checked Sep 3, 2026
4
GCLIndirect evidence
Birmingham, United KingdomHQ checked Sep 3, 202651-200120

“GCL, with its unique, non-scripted approach to telemarketing and related marketing services, has for over 30 years established an enviable reputation for providing winning lead…”

Source: company website · checked Sep 3, 2026
5
EC Outsourcing Powered By Ison XperiencesIndirect evidence
Doxford International Business Park, United KingdomHQ checked Sep 3, 20261,001-5,000115

“EC Outsourcing is one of the UK's leading outsourced contact centres.”

Source: company website · checked Sep 3, 2026
6
DurhamlaneIndirect evidence
Newcastle Upon Tyne, United KingdomHQ checked Sep 3, 202651-200114

“More than SDR Outsourcing.”

Source: company website · checked Sep 3, 2026
7
Pursuit MarketingIndirect evidence
Glasgow, United KingdomHQ checked Sep 3, 202651-20096

“Pursuit Marketing are Experts in Demand Generation, Telemarketing, Digital Marketing and Creative Design - your 360 Marketing Provider.”

Source: company website · checked Sep 3, 2026
8
Voice Marketing LTDIndirect evidence
Sheffield, United KingdomHQ checked Sep 3, 2026201-50075

“Voice is an agency that specialises in customer acquisition, development and retention programs.”

Source: company website · checked Sep 3, 2026
9
Excelerate360Partial evidence
Hitchin, United KingdomHQ checked Sep 3, 202651-20065

“Excelerate360 offers business development and sales outsourcing services for B2B software and technology companies in the UK, Europe, and North America.”

Source: company website · checked Sep 3, 2026
10
Impact Call CentreIndirect evidence
Romsey, United KingdomHQ checked Sep 3, 2026201-50055

“Employing over 250 staff, we are a well-established, highly regarded and successful outsourced multi-channel contact centre.”

Source: company website · checked Sep 3, 2026
11
FLY PIE LTDPartial evidence
London, United KingdomHQ checked Sep 3, 202651-20049

“At Fly Pie, sales outsourcing isn’t a “done-for-you” service, it’s a growth engine we build with you.”

Source: company website · checked Sep 3, 2026
12
Advance ConnectsIndirect evidence
Ellesmere Port, United KingdomHQ checked Sep 3, 202651-20045

“Advance Connects are a B2B telemarketing, lead generation & appointment scheduling experts, operating within various sectors including construction, built environment, industrial…”

Source: company website · checked Sep 3, 2026
13
Parallel Partnerships LTDIndirect evidence
Leeds, United KingdomHQ checked Sep 3, 202651-20043

“B2B and B2C outsourced Telemarketing agency.”

Source: company website · checked Sep 3, 2026
14
MatterIndirect evidence
Leeds, United KingdomHQ checked Sep 3, 202651-20039

“The problem with B2B growth isn't a lack of activity.”

Source: company website · checked Sep 3, 2026
15
Stack Solutions GroupIndirect evidence
London, United KingdomHQ checked Sep 3, 2026201-50039

“At Stack Solutions Group, we help ambitious brands grow faster, smarter, and more efficiently - across any market.”

Source: company website · checked Sep 3, 2026
16
1 Stop Data LTDIndirect evidence
Ewell, United KingdomHQ checked Sep 3, 202651-20035

“1 Stop Data offers the best of breed Marketing, Lead Generation and Call Centre services.”

Source: company website · checked Sep 3, 2026
17
Paragon Marketing ProjectsIndirect evidence
Portsmouth, United KingdomHQ checked Sep 3, 202651-20032

“Working with clients across a variety of sectors, Paragon is a leading provider of B2B lead generation and appointment setting marketing projects with vast experience in creating…”

Source: company website · checked Sep 3, 2026
18
TELUIndirect evidence
Leeds, United KingdomHQ checked Sep 3, 202651-20032

“Telu is the complete business solution for generating leads and revenue for your business.”

Source: company website · checked Sep 3, 2026
19
SLM ConnectIndirect evidence
Manchester, United KingdomHQ checked Sep 3, 2026201-50027

“Since SLM Connect started up as a contact centre in 2008, we've supplied more than customers to our clients.”

Source: company website · checked Sep 3, 2026
20
1call DirectIndirect evidence
Glasgow, United KingdomHQ checked Sep 3, 202651-20026

“Established in 1988 in London as Hotlines Telemarketing Ltd, the Glasgow branch (which was established in June rebranded as 1Call Direct in October 2003.”

Source: company website · checked Sep 3, 2026
21
AGO OutsourcingStrong evidence
East Kilbride, United KingdomHQ checked Sep 3, 202651-20019

“AGO Outsourcing is a leading provider of outsourced business services, including inbound and outbound customer service and outbound sales as well as social media engagement…”

Source: company website · checked Sep 3, 2026
22
BIG Wolf MarketingIndirect evidence
London, United KingdomHQ checked Sep 3, 202651-20016

“Big Wolf Marketing - Leaders in B2B Telemarketing, Lead Generation & Appointment Setting With a vast combined experience, implementing established and cutting edge innovative…”

Source: company website · checked Sep 3, 2026
23
Adds CorporationIndirect evidence
London, United KingdomHQ checked Sep 3, 202651-20016

“ADDS Corporation is a one-stop marketplace for the best B2B Marketers, Agencies, Publishers, and Lead Generation Solution Providers.”

Source: company website · checked Sep 3, 2026
24
Callent Tech LTDIndirect evidence
London, United KingdomHQ checked Sep 3, 202651-20012

“Welcome to Callent Tech, The Future of B2B Demand Generation.”

Source: company website · checked Sep 3, 2026
25
The Chat ShopPartial evidence
London, United KingdomHQ checked Sep 3, 202651-20011

“We increase sales leads by 50% and achieve 99% customer satisfaction with our UK- and US-based team.”

Source: company website · checked Sep 3, 2026

Showing 25 of 1,001 outbound sales agencies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,558 reachable decision-makers.

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Outbound sales agencies based in the United Kingdom at a glance

As of Sep 3, 2026
1-10Median size (employees)
LondonLargest hub · 326 HQs
453Contacts with mobile numbers
Sep 3, 2026Data refreshed

Companies by employee count

1-10
632
11-50
267
51-200
76
201-500
16
501-1,000
1
1,001-5,000
2
10001+
1

Verified emails by last verification

0–30
0
31–60
139
61–90
847
90–180
558
180+
14

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among outbound sales agencies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in the United Kingdom whose own description of what they do matches “outbound sales agencies”. Matching reads each company's description, not its industry code or its name.
What we exclude
Companies whose own description does not clearly place them among outbound sales agencies, and records with no verified work email. Companies headquartered outside United Kingdom are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 1,558 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 3, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Outbound sales agencies by metro

  • Outbound sales agencies in London326
  • Outbound sales agencies in Manchester56
  • Outbound sales agencies in Birmingham27

Frequently asked

How many outbound sales agencies are there based in the United Kingdom?

RevenueBase identified 1,001 outbound sales agencies headquartered in the United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

MVF, headquartered in London, tops this list with the largest team on record.

Which city has the most outbound sales agencies?

London leads with 326 headquartered companies, followed by Manchester (56) and Birmingham (27).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 1,558 verified decision-maker contacts tracked across these 1,001 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 3, 2026.

Ready to reach these companies? Verified emails and direct dials for all 1,001 outbound sales agencies based in the United Kingdom. Start with a free account, no credit card.

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Related lists

Browse: Companies home · All United Kingdom lists · All Outbound sales agencies lists · New lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.

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