Company lists · Data refreshed September 2026

Top 25 Customer service outsourcing companies based in London, United Kingdom

Name: Customer service outsourcing companies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 10, 2026 145 companies tracked

RevenueBase identified 145 company matches for customer service outsourcing companies associated with London, United Kingdom as of September 2026 and tracks 23,030 professional contacts across them, including 4,875 with verified work emails and 776 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for customer service outsourcing companies associated with London, United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 10, 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 RevenueBase SmartSearch · Exact Recorded Sep 10, 2026 How this list was built

145Companies

23,030Contacts tracked

4,875Verified emails

776Mobile numbers

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The 25 largest customer service outsourcing companies based in London, United Kingdom

Ranked by team size

Top 25 of 145 company matches for customer service outsourcing companies based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 10, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Capita	Exact match	London, United KingdomHQ recorded Sep 10, 2026	10001+	20,824 contacts →
	Exact match “Capita is an outsourcer, helping clients across the public and private sectors run complex business processes more efficiently, creating better consumer experiences.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
2	Vertex Data Science	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	569 contacts →
	Exact match “Vertex is a leader in BPO and Customer Management Outsourcing, serving over 200 clients worldwide across many sectors.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
3	Convergys Limited	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	144 contacts →
	Exact match “Convergys is a world-class customer management firm made up of employees working in more than 150 service centers and 31 countries.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
4	Rsvp Media Response LTD	Exact match	London, United KingdomHQ recorded Sep 10, 2026	201-500	98 contacts →
	Exact match “Founded in 1988, RSVP is the oldest provider of contact centre services in the UK.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
5	Youpro Contact	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	90 contacts →
	Exact match “A world class offshore outsourcing agency, with offices in London and Harare, we have access to some of the best educated, best spoken graduates you will find anywhere in the…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
6	Xanadutec	Exact match	London, United KingdomHQ recorded Sep 10, 2026	201-500	70 contacts →
	Exact match “We are a 400 member strong, specialist business process outsourcing (BPO) provider that caters to the diverse and complex information processing needs of todays corporation.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
7	Qormotho	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	66 contacts →
	Exact match “QORMOTHO is a global outsourcing company.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
8	Support Adventure	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	62 contacts →
	Exact match “Support Adventure is an outsourcing company that specializes in customer service and support.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
9	Callcare	Exact match	London, United KingdomHQ recorded Sep 10, 2026	1,001-5,000	59 contacts →
	Exact match “CallCare is your outsourced contact centre and customer service partner.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
10	FLY PIE LTD	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	48 contacts →
	Exact match “At Fly Pie, sales outsourcing isn’t a “done-for-you” service, it’s a growth engine we build with you.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
11	Direct Response	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	46 contacts →
	Exact match “Direct Response can provide outsourcing of voice, data and contact centre services for organisation from a global business to a one-man operation, delivering outstanding service…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
12	Excevo	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	43 contacts →
	Exact match “Excevo is proud to offer world class, out-sourced customer service for brands across the globe.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
13	Kingdom Vision	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	40 contacts →
	Exact match “Kingdom Vision is a medium to take your business from good to great.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
14	Systemrapid	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	33 contacts →
	Exact match “SystemRapid - inner feelings.outsourced.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
15	Resolvable	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	28 contacts →
	Exact match “Our customer service outsourcing and software solutions create happier customers, happier customer service agents, and save you money.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
16	Kimon Services	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	16 contacts →
	Exact match “Kimon Services provides high-quality outsourced staff across various industries and disciplines, including customer service, data entry, call centres, marketing and sales support…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
17	Appamondo	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	14 contacts →
	Exact match “Customer service has never been more important.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
18	The Sales Centre	Exact match	London, United KingdomHQ recorded Sep 10, 2026	1-10	14 contacts →
	Exact match “We are an outsourcing agency specializing in sales, marketing, and customer support.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
19	Capita Business Services	Exact match	London, United KingdomHQ recorded Sep 10, 2026	n/a	13 contacts →
	Exact match “Capita is the UK's leading FTSE100 outsourcing company.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
20	Transaction Focus	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	10 contacts →
	Exact match “Transaction Focus is a leading Global outsourced sales and marketing company with headquarters in the United Kingdom with connections and associates based in China,the USA…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
21	Confero Limited	Exact match	London, United KingdomHQ recorded Sep 10, 2026	51-200	8 contacts →
	Exact match “Confero is a UK based outsourced call centre business, focussed on delivering high quality inbound, outbound, and digital services to our clients.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
22	Handover Work	Exact match	London, United KingdomHQ recorded Sep 10, 2026	1-10	7 contacts →
	Exact match “We will help you achieve new levels in productivity, cost saving and customer satisfaction, along with many more benefits.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
23	Alaouico	Exact match	London, United KingdomHQ recorded Sep 10, 2026	1-10	7 contacts →
	Exact match “At alaouico, we understand the challenges businesses face with customer interactions-whether it's managing high call volumes, ensuring timely responses, or maintaining customer…” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
24	Cxhero	Exact match	London, United KingdomHQ recorded Sep 10, 2026	1-10	6 contacts →
	Exact match “Traditional outsourcing can leave you feeling like you're spinning your wheels.” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase
25	VAYO	Exact match	London, United KingdomHQ recorded Sep 10, 2026	11-50	3 contacts →
	Exact match “VAYO - The New Way!” Recorded in the RevenueBase company graph · Sep 10, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “customer service outsourcing companies”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 145 customer service outsourcing companies based in London, United Kingdom

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Customer service outsourcing companies based in London, United Kingdom at a glance

As of Sep 10, 2026

21.2%Verified-email coverage

3.4%Mobile-number coverage

158.8Average contacts per company

11-50Median size (employees)

Sep 10, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 13.0d

4,5270–30

32231–60

061–90

090–180

26180+

Company record updated

Median 77.0d

00–30

4,49431–60

14,55661–90

3,10890–180

872180+

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

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: Company records associated with London, United Kingdom whose business descriptions match “customer service outsourcing companies” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 4,875 professional contacts with verified work emails across the full matched dataset. 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 10, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “customer service outsourcing companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many customer service outsourcing companies are there based in London, United Kingdom?

RevenueBase identified 145 company matches for customer service outsourcing companies associated with London, United Kingdom as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Capita tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United Kingdom has the most customer service outsourcing companies?

London leads the United Kingdom with 144 company records, followed by Manchester (20) and Bristol (10).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 4,875 professional contacts with verified work emails tracked across these 145 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 10, 2026.

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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.