Company lists · Data verified August 2026

Top 25 Contact centers based in the United Kingdom

Name: Contact centers 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 496 companies tracked

There are 496 contact centers headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 13,376 professional contacts across them, including 3,504 with verified work emails and 1,027 with mobile numbers. London is the largest hub.

This list covers contact centers 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.

496Companies

13,376Contacts tracked

3,504Verified emails

1,027Mobile numbers

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The 25 largest contact centers based in the United Kingdom

Ranked by team size

Top 25 of 496 contact centers 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	8x8	Aylesbury	1,001-5,000	2,427	1,335
2	Convergys Intelligent Contact	Manchester	10001+	876	37
3	RESQ	Seaham	1,001-5,000	493	149
4	IST Networks	London	201-500	456	206
5	Pelatro	London	201-500	343	145
6	ANT Marketing	Sheffield	501-1,000	328	35
7	The Contact Company	Wirral	1,001-5,000	324	17
8	The Telemarketing Company	Brighton	201-500	242	39
9	ECKOH	Hemel Hempstead	201-500	202	124
10	Clearanswer Call Centres	Leeds	501-1,000	202	24
11	Interact Contact Centres	Richmond	501-1,000	159	75
12	Echo-U LTD	Newcastle Upon Tyne	201-500	140	7
13	We ARE Woven	Bristol	1,001-5,000	131	11
14	Step Change Outsourcing	Stevenage	201-500	115	20
15	EC Outsourcing Powered By Ison Xperiences	Sheffield	1,001-5,000	115	1
16	Rsvp Media Response LTD	London	201-500	95	22
17	FM Outsource	Bury	201-500	82	33
18	Loop Customer Management	Bradford	501-1,000	77	33
19	Connect Assist	Cardiff	201-500	73	24
20	Callcare	London	1,001-5,000	59	13
21	Impact Call Centre	Romsey	201-500	55	14
22	Effebot	London	201-500	40	3
23	Chase Response	Croydon	501-1,000	39	3
24	Spark Response	Gateshead	201-500	36	5
25	Sensible Group International	Manchester	201-500	36	3

Showing 25 of 496 contact centers based in the United Kingdom

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Contact centers based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 109 HQs

1,027Contacts with mobile numbers

6Emails re-verified in last 30 days

Companies by employee count

1-10

166

11-50

159

51-200

100

201-500

501-1,000

1,001-5,000

10001+

Contact centers by metro

Metro	Companies
Contact centers in London	109
Contact centers in Manchester	26
Contact centers in Bristol	11
Contact centers in Sheffield	10
Contact centers in Leeds	10
Contact centers in Glasgow	8
Contact centers in Norwich	7

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 “contact centers”, 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; 6 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 contact centers are there based in the United Kingdom?

There are 496 contact centers headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

8x8, headquartered in Aylesbury, tops this list with the largest team on record.

Which city has the most contact centers?

London leads with 109 headquartered companies, followed by Manchester (26) and Bristol (11).

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 3,504 verified decision-maker contacts tracked across these 496 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.