Company lists · Data refreshed September 2026

Top 25 Contact centers based in London, United Kingdom

Name: Contact centers based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 8, 2026 118 companies tracked

RevenueBase identified 118 contact centers headquartered in London, United Kingdom as of September 2026 and tracks 1,462 professional contacts across them, including 289 with verified work emails and 73 with mobile numbers. London is the largest hub.

This list covers contact centers headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 8, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 8, 2026 86% judged on-target in blind review

118Companies

1,462Contacts tracked

289Verified emails

73Mobile numbers

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The 25 largest contact centers based in London, United Kingdom

Ranked by team size

Top 25 of 118 contact centers based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 8, 2026. RevenueBase Smart Search rates how each company's information relates to contact centers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Convergys Limited	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	144 contacts →
	Partial evidence “Convergys is a world-class customer management firm made up of employees working in more than 150 service centers and 31 countries.” Source: RevenueBase Database · checked Sep 8, 2026
2	Natterbox	Strong evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	127 contacts →
	Strong evidence “Natterbox is an AI-powered contact center solution that's natively integrated to Salesforce.” Source: RevenueBase Database · checked Sep 8, 2026
3	Rsvp Media Response LTD	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	201-500	98 contacts →
	Partial evidence “Founded in 1988, RSVP is the oldest provider of contact centre services in the UK.” Source: RevenueBase Database · checked Sep 8, 2026
4	Youpro Contact	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	90 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 8, 2026
5	Business Systems	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	63 contacts →
	Partial evidence “Business Systems is a trusted transformation partner with over 35 years of experience helping CX teams and contact centres become smarter, faster and more compliant.” Source: RevenueBase Database · checked Sep 8, 2026
6	Support Adventure	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	62 contacts →
	Indirect evidence “Support Adventure is an outsourcing company that specializes in customer service and support.” Source: RevenueBase Database · checked Sep 8, 2026
7	Callcare	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	1,001-5,000	59 contacts →
	Partial evidence “CallCare is your outsourced contact centre and customer service partner.” Source: RevenueBase Database · checked Sep 8, 2026
8	Direct Response	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	46 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 8, 2026
9	Kingdom Vision	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	40 contacts →
	Indirect evidence “Kingdom Vision is a medium to take your business from good to great.” Source: RevenueBase Database · checked Sep 8, 2026
10	Ccma Contact Centre Management Association	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	33 contacts →
	Partial evidence “For more than 30 years, the CCMA has been dedicated to supporting contact centre leaders.” Source: RevenueBase Database · checked Sep 8, 2026
11	rocketphone.ai	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	30 contacts →
	Indirect evidence “RocketPhone.ai empowers organisations to unlock the full potential of their customer conversations by transforming them into actionable insights.” Source: RevenueBase Database · checked Sep 8, 2026
12	Noetica	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	25 contacts →
	Partial evidence “Noetica are a provider of Customer Interaction Management software for use in contact centres.” Source: RevenueBase Database · checked Sep 8, 2026
13	Voipstudio	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	17 contacts →
	Partial evidence “VoIPstudio is a complete business phone system and scalable call center with small business pricing.” Source: RevenueBase Database · checked Sep 8, 2026
14	Call Handling Services	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	16 contacts →
	Partial evidence “Specialised cloud contact centre services for charities, retail, public bodies & construction.” Source: RevenueBase Database · checked Sep 8, 2026
15	Appamondo	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	14 contacts →
	Indirect evidence “Customer service has never been more important.” Source: RevenueBase Database · checked Sep 8, 2026
16	Confero Limited	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	51-200	8 contacts →
	Indirect evidence “Confero is a UK based outsourced call centre business, focussed on delivering high quality inbound, outbound, and digital services to our clients.” Source: RevenueBase Database · checked Sep 8, 2026
17	Real Calling	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	8 contacts →
	Indirect evidence “Experts in having great conversations, REAL Calling are part of the REAL Family that has been delivering industry-leading face to face fundraising for over 13 years in the UK.” Source: RevenueBase Database · checked Sep 8, 2026
18	Invomo LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	8 contacts →
	Indirect evidence “Invomo’s hosted applications and services can transform phone-based communications with an organisation’s customers - whether landline or mobile, inbound and outbound.” Source: RevenueBase Database · checked Sep 8, 2026
19	Alaouico	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	7 contacts →
	Indirect evidence “At alaouico, we understand the challenges businesses face with customer interactions-whether it's managing high call volumes, ensuring timely responses, or maintaining customer…” Source: RevenueBase Database · checked Sep 8, 2026
20	Phase2	Partial evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	7 contacts →
	Partial evidence “Phase2 is a specialist Cloud Contact Centre (CCaaS) solutions partner, delivering bespoke, data-driven solutions that transform customer experience and business operations.” Source: RevenueBase Database · checked Sep 8, 2026
21	The Sherriff Centre	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	3 contacts →
	Indirect evidence “We offer extended opening hours for greater convenience for our customers and have 3 counter positions to serve you.” Source: RevenueBase Database · checked Sep 8, 2026
22	Cordless	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	2 contacts →
	Indirect evidence “Cordless is a modern cloud-based call centre for customer support teams, with built-in conversational intelligence.” Source: RevenueBase Database · checked Sep 8, 2026
23	Niche Marketing LTD	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	2 contacts →
	Indirect evidence “At Niche, it is not about the number of calls made but about quality.” Source: RevenueBase Database · checked Sep 8, 2026
24	Echo AI	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	1-10	2 contacts →
	Indirect evidence “Empower agents to answer more calls with confidence.” Source: RevenueBase Database · checked Sep 8, 2026
25	Nsibandze Outsourcing NOS	Indirect evidence	London, United KingdomHQ checked Sep 8, 2026	11-50	1 contacts →
	Indirect evidence “Nsibandze Outsourcing (“NOS”) is a global CX business on a mission to ignite opportunity for small and medium sized companies through telemarketing, lead generation, data analysis…” Source: RevenueBase Database · checked Sep 8, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: contact centers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names contact centers.
Partial evidence: Its own public description names part of contact centers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name contact centers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 118 contact centers based in London, United Kingdom

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Contact centers based in London, United Kingdom at a glance

As of Sep 8, 2026

19.8%Verified-email coverage

5.0%Mobile-number coverage

12.4Average contacts per company

11-50Median size (employees)

92.4%Largest-city concentration · London

Sep 8, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

10001+

Freshness & accuracy

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

Email last verified

Median 10.0d

2620–30

2531–60

061–90

090–180

2180+

Company record updated

Median 74.0d

00–30

58831–60

65661–90

13290–180

86180+

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among contact centers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “contact centers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names contact centers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among contact centers, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 289 across the full list. 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 8, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Contact centers by metro in the United Kingdom

Contact centers in London109
Contact centers in Manchester26

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names contact centers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many contact centers are there based in London, United Kingdom?

RevenueBase identified 118 contact centers headquartered in London, United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Convergys Limited, headquartered in London, 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 289 verified decision-maker contacts tracked across these 118 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 8, 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 Smart Search, 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.