Company lists · Data verified August 2026

Top 25 Cold calling agencies based in the United Kingdom

Name: Cold calling agencies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 437 companies tracked

There are 437 cold calling agencies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 4,599 professional contacts across them, including 797 with verified work emails and 247 with mobile numbers. London is the largest hub.

This list covers cold calling 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. Data current as of August 28, 2026.

437Companies

4,599Contacts tracked

797Verified emails

247Mobile numbers

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The 25 largest cold calling agencies based in the United Kingdom

Ranked by team size

Top 25 of 437 cold calling agencies based in the United Kingdom, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	The Telemarketing Company	Brighton	201-500	242	39
2	BNZSA	London	201-500	195	6
3	AIR Marketing	Exeter	51-200	123	47
4	GCL	Birmingham	51-200	120	18
5	EC Outsourcing Powered By Ison Xperiences	Sheffield	1,001-5,000	115	1
6	Durhamlane	Newcastle Upon Tyne	51-200	114	74
7	Pursuit Marketing	Glasgow	51-200	96	8
8	Alliance Sales Support Services Limited	Tunbridge Wells	51-200	80	64
9	Excelerate360	Hitchin	51-200	65	19
10	Marathon B2B	London	51-200	52	1
11	Advance Connects	London	51-200	45	20
12	Broadley Speaking	Tavistock	11-50	45	12
13	Beanstalk Marketing	Birmingham	11-50	43	33
14	Parallel Partnerships LTD	Leeds	51-200	43	7
15	Seventic	London	11-50	38	4
16	Econtact Services-Telco Experts	Lanark	11-50	37	4
17	1 Stop Data LTD	Northern	51-200	35	3
18	Paragon Marketing Projects	Portsmouth	51-200	32	23
19	TELU	Leeds	51-200	32	6
20	The Lead Generation Company	Manchester Manchester	11-50	28	10
21	SLM Connect	Manchester	201-500	27	1
22	1call Direct	Glasgow	51-200	26	1
23	The Lead GEN Specialists	n/a	11-50	25	9
24	Bollin Green	Macclesfield	11-50	22	17
25	Blue Donkey LTD	Soham Ely	11-50	22	5

Showing 25 of 437 cold calling 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 797 reachable decision-makers.

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Cold calling agencies based in the United Kingdom at a glance

As of Aug 28, 2026

1-10Median size (employees)

LondonLargest hub · 86 HQs

247Contacts with mobile numbers

5Emails re-verified in last 30 days

Companies by employee count

1-10

242

11-50

135

51-200

201-500

501-1,000

1,001-5,000

10001+

Cold calling agencies by metro

Metro	Companies
Cold calling agencies in London	86
Cold calling agencies in Manchester	19
Cold calling agencies in Birmingham	14
Cold calling agencies in Leeds	12
Cold calling agencies in Bristol	8
Cold calling agencies in Oxford	5
Cold calling agencies in Portsmouth	5

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “cold calling agencies”, with match quality audited by blind human judging, and headquartered in the United Kingdom.
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: Contact records re-verify on a rolling cadence; 5 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many cold calling agencies are there based in the United Kingdom?

There are 437 cold calling agencies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

The Telemarketing Company, headquartered in Brighton, tops this list with the largest team on record.

Which city has the most cold calling agencies?

London leads with 86 headquartered companies, followed by Manchester (19) and Birmingham (14).

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 797 verified decision-maker contacts tracked across these 437 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.