Company lists · Data verified August 2026

Top 25 Customer support outsourcing companies based in the United Kingdom

Name: Customer support outsourcing companies 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 298 companies tracked

There are 298 customer support outsourcing companies headquartered in the United Kingdom (RevenueBase, August 2026). RevenueBase tracks 7,740 professional contacts across them, including 1,114 with verified work emails and 290 with mobile numbers. London is the largest hub.

This list covers customer support outsourcing companies 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.

298Companies

7,740Contacts tracked

1,114Verified emails

290Mobile numbers

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The 25 largest customer support outsourcing companies based in the United Kingdom

Ranked by team size

Top 25 of 298 customer support outsourcing companies 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	Vertex Data Science	London	51-200	570	1
2	ESP Global Services	Reading	501-1,000	507	339
3	RESQ	Seaham	1,001-5,000	493	149
4	ANT Marketing	Sheffield	501-1,000	328	35
5	The Contact Company	Wirral	1,001-5,000	324	17
6	Response	n/a	1,001-5,000	241	67
7	Clearanswer Call Centres	Leeds	501-1,000	202	24
8	Echo-U LTD	Newcastle Upon Tyne	201-500	140	7
9	We ARE Woven	Bristol	1,001-5,000	131	11
10	Exquisite Solution Limited	London	501-1,000	104	4
11	Subfero	Bristol	51-200	84	2
12	FM Outsource	Bury	201-500	82	33
13	Sirius Support	London	51-200	81	3
14	Alliance Sales Support Services Limited	Tunbridge Wells	51-200	80	64
15	Connect Assist	Cardiff	201-500	73	24
16	Tellida Private Limited	n/a	51-200	73	17
17	Callcare	London	1,001-5,000	59	13
18	Impact Call Centre	Romsey	201-500	55	14
19	Orca Call Answering & Live Chat	Wrexham	51-200	54	12
20	Cymphony	Crewe	51-200	52	15
21	Direct Response	London	51-200	46	6
22	Dawleys	Ross-On-Wye	51-200	43	16
23	Orion Call Centre	n/a	51-200	41	3
24	Chase Response	Croydon	501-1,000	39	3
25	Sensible Group International	Manchester	201-500	36	3

Showing 25 of 298 customer support outsourcing companies based in the United Kingdom

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 1,114 reachable decision-makers.

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Customer support outsourcing companies based in the United Kingdom at a glance

As of Aug 28, 2026

11-50Median size (employees)

LondonLargest hub · 102 HQs

290Contacts with mobile numbers

2Emails 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

5,001-10,000

Customer support outsourcing companies by metro

Metro	Companies
Customer support outsourcing companies in London	102
Customer support outsourcing companies in Manchester	14
Customer support outsourcing companies in Birmingham	7
Customer support outsourcing companies in Bristol	7
Customer support outsourcing companies in Newcastle Upon Tyne	5
Customer support outsourcing companies in Leicester	4
Customer support outsourcing companies in Preston	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 “customer support outsourcing companies”, 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; 2 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 customer support outsourcing companies are there based in the United Kingdom?

There are 298 customer support outsourcing companies headquartered in the United Kingdom as of August 2026 (RevenueBase).

What is the largest company on this list?

Vertex Data Science, headquartered in London, tops this list with the largest team on record.

Which city has the most customer support outsourcing companies?

London leads with 102 headquartered companies, followed by Manchester (14) and Birmingham (7).

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 1,114 verified decision-maker contacts tracked across these 298 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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Customer support outsourcing companies by geography

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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.