Company lists · Data verified August 2026

Top 25 Call center service providers based in the United Kingdom

Name: Call center service providers 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 174 companies tracked

There are 174 call center service providers headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 4,823 professional contacts across them, including 586 with verified work emails and 204 with mobile numbers. London is the largest hub.

This list covers call center service providers 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.

174Companies

4,823Contacts tracked

586Verified emails

204Mobile numbers

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The 25 largest call center service providers based in the United Kingdom

Ranked by team size

Top 25 of 174 call center service providers 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	Convergys Intelligent Contact	Manchester	10001+	876	37
2	RESQ	Seaham	1,001-5,000	493	149
3	ANT Marketing	Sheffield	501-1,000	328	35
4	The Contact Company	Wirral	1,001-5,000	324	17
5	Response	n/a	1,001-5,000	241	67
6	Clearanswer Call Centres	Leeds	501-1,000	202	24
7	Echo-U LTD	Newcastle Upon Tyne	201-500	140	7
8	We ARE Woven	Bristol	1,001-5,000	131	11
9	Rsvp Media Response LTD	London	201-500	95	22
10	Subfero	Bristol	51-200	84	2
11	FM Outsource	Bury	201-500	82	33
12	Connect Assist	Cardiff	201-500	73	24
13	Callcare	London	1,001-5,000	59	13
14	Impact Call Centre	Romsey	201-500	55	14
15	Orca Call Answering & Live Chat	Wrexham	51-200	54	12
16	Direct Response	London	51-200	46	6
17	Chase Response	Croydon	501-1,000	39	3
18	Spark Response	Gateshead	201-500	36	5
19	Sensible Group International	Manchester	201-500	36	3
20	Weanswer	Chippenham	201-500	29	6
21	Opencontact	Norwich	51-200	24	13
22	AGO Outsourcing	East Kilbride	51-200	19	1
23	Phoneta	Barncoose Redruth	51-200	17	8
24	Globe Call Center	Wilmington	51-200	14	3
25	Forge Solutions LTD	Manchester	51-200	8	1

Showing 25 of 174 call center service providers based in the United Kingdom

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Call center service providers based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 37 HQs

204Contacts with mobile numbers

1Emails re-verified in last 30 days

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Call center service providers by metro

Metro	Companies
Call center service providers in London	37
Call center service providers in Manchester	8
Call center service providers in Bristol	5
Call center service providers in Newbury	4
Call center service providers in Sheffield	4
Call center service providers in Norwich	3
Call center service providers in Nottingham	3

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 “call center service providers”, 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; 1 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 call center service providers are there based in the United Kingdom?

There are 174 call center service providers headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Convergys Intelligent Contact, headquartered in Manchester, tops this list with the largest team on record.

Which city has the most call center service providers?

London leads with 37 headquartered companies, followed by Manchester (8) and Bristol (5).

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 586 verified decision-maker contacts tracked across these 174 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.