Company lists · Data refreshed September 2026

Top 25 Customer support outsourcing firms based in London, United Kingdom

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 147 companies tracked

RevenueBase identified 147 company matches for customer support outsourcing firms associated with London, United Kingdom as of September 2026 and tracks 2,313 professional contacts across them, including 173 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for customer support outsourcing firms 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 28, 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 28, 2026 How this list was built

147Companies

2,313Contacts tracked

173Verified emails

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The 25 largest customer support outsourcing firms based in London, United Kingdom

Ranked by team size

Top 25 of 147 company matches for customer support outsourcing firms based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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	Vertex Data Science	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
2	Rsvp Media Response LTD	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
3	Youpro Contact	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
4	Sirius Support	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	85 contacts →
	Exact match “Humanizing AI-Powered Customer Support The future of customer support is intelligent, efficient-and unmistakably human.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Qormotho	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	66 contacts →
	Exact match “QORMOTHO is a global outsourcing company.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Field Techs Services LTD	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	63 contacts →
	Exact match “Field Techs Services LTD is a best one IT support providing company in EMEA, APAC and LATUM.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Support Adventure	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
8	Callcare	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
9	FLY PIE LTD	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
10	Direct Response	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
11	Excevo	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
12	Kingdom Vision	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
13	Techno Networks	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	38 contacts →
	Exact match “We are focused on providing on-demand and well-managed IT support services around the globe and around the clock.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	auxilium.digital	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	35 contacts →
	Exact match “Auxilium Digital helps businesses with limited resources, higher operational costs achieve utmost customer satisfaction through providing customized offshore development teams…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Resolvable	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
16	Giotech IT Support London	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	17 contacts →
	Exact match “Giotech - Elevating Your IT Experience.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Kimon Services	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
18	Appamondo	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	14 contacts →
	Exact match “Customer service has never been more important.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	The Sales Centre	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
20	EVO Network-Ict	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	13 contacts →
	Exact match “EVO Network ICT is one of the leading ICT support providers in the UK, delivering reliable and well-managed IT services to our valued clients across the globe.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	The Chat Shop	Exact match	London, United KingdomHQ recorded Sep 28, 2026	51-200	11 contacts →
	Exact match “We increase sales leads by 50% and achieve 99% customer satisfaction with our UK- and US-based team.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	White Label IT	Exact match	London, United KingdomHQ recorded Sep 28, 2026	11-50	10 contacts →
	Exact match “As your MSP grows, your helpdesk has to grow with it.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
23	Confero Limited	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
24	Handover Work	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 2026 · View company records in RevenueBase
25	Alaouico	Exact match	London, United KingdomHQ recorded Sep 28, 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 28, 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 support outsourcing firms”. 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 147 customer support outsourcing firms based in London, United Kingdom

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Customer support outsourcing firms based in London, United Kingdom at a glance

As of Sep 28, 2026

7.5%Verified-email coverage

15.7Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 147 companies.

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 support outsourcing firms” 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 173 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 28, 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 support outsourcing firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many customer support outsourcing firms are there based in London, United Kingdom?

RevenueBase identified 147 company matches for customer support outsourcing firms 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?

Vertex Data Science 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 support outsourcing firms?

London leads the United Kingdom with 147 company records, followed by Manchester (18) and Birmingham (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 173 professional contacts with verified work emails tracked across these 147 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 28, 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.