Company lists · Data refreshed September 2026

Top 25 Customer retention agencies based in the United Kingdom

Name: Customer retention agencies based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 764 companies tracked

RevenueBase identified 764 customer retention agencies headquartered in the United Kingdom as of September 2026 and tracks 9,797 professional contacts across them, including 3,678 with verified work emails. London is the largest hub.

This list covers customer retention agencies headquartered in the 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 19, 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 19, 2026 86% judged on-target in blind review

764Companies

9,797Contacts tracked

3,678Verified emails

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The 25 largest customer retention agencies based in the United Kingdom

Ranked by team size

Top 25 of 764 customer retention agencies based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to customer retention agencies: 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	TLC Worldwide	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	979 contacts →
	Partial evidence “TLC Worldwide is a global leader in customer engagement, loyalty, and reward solutions.” Source: RevenueBase Database · checked Sep 19, 2026
2	Nectar360	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	254 contacts →
	Partial evidence “Nectar360 starts with the UK’s largest multi partner loyalty programme and ends with brands connecting to their customers in smarter, more meaningful ways.” Source: RevenueBase Database · checked Sep 19, 2026
3	GO Inspire Group	Indirect evidence	Leicester, United KingdomHQ checked Sep 19, 2026	201-500	210 contacts →
	Indirect evidence “Welcome to Go Inspire - Your Marketing Performance Partner!” Source: RevenueBase Database · checked Sep 19, 2026
4	Cc33 Global Limited	Indirect evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	201-500	172 contacts →
	Indirect evidence “CC33 is a boutique agency with big ideas providing marketing solutions tailored to specifically meet your sales and marketing needs.” Source: RevenueBase Database · checked Sep 19, 2026
5	MANDO	Indirect evidence	Aylesbury, United KingdomHQ checked Sep 19, 2026	n/a	163 contacts →
	Indirect evidence “Mando is made up of three specialist divisions delivering promotional, partnership, loyalty and rewards solutions, powered by cutting-edge data and insight from three unique…” Source: RevenueBase Database · checked Sep 19, 2026
6	AVIOS	Partial evidence	Crawley, United KingdomHQ checked Sep 19, 2026	501-1,000	121 contacts →
	Partial evidence “The Loyalty Partner of Choice in Travel Avios are experts in customer loyalty, with the ambition to be the Loyalty Partner of Choice in Travel.” Source: RevenueBase Database · checked Sep 19, 2026
7	Ello Group	Indirect evidence	Huddersfield, United KingdomHQ checked Sep 19, 2026	11-50	113 contacts →
	Indirect evidence “We’re Ello, the agency who create everlasting connections between brands and consumers.” Source: RevenueBase Database · checked Sep 19, 2026
8	Underground Ecom	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	102 contacts →
	Partial evidence “Underground Ecom is a rapidly growing Email marketing agency specialising in helping ecommerce businesses reach their full potential through retention marketing.” Source: RevenueBase Database · checked Sep 19, 2026
9	LIDA	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	97 contacts →
	Indirect evidence “LIDA: The next generation loyalty agency Loyalty has united families, mobilised armies and moved electorates.” Source: RevenueBase Database · checked Sep 19, 2026
10	Circlesquare	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	92 contacts →
	Partial evidence “We are customer experience experts, working with our clients on bespoke strategies to engage customers along the entire customer journey.” Source: RevenueBase Database · checked Sep 19, 2026
11	Momentumabm	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	89 contacts →
	Indirect evidence “MomentumABM is a growth consultancy that enables global organizations to achieve market-beating performance by winning, growing, and retaining their most valuable client…” Source: RevenueBase Database · checked Sep 19, 2026
12	BLUME	Partial evidence	Manchester, United KingdomHQ checked Sep 19, 2026	51-200	87 contacts →
	Partial evidence “Blume is here to help our customers grow.” Source: RevenueBase Database · checked Sep 19, 2026
13	EYC	Partial evidence	Richmond, United KingdomHQ checked Sep 19, 2026	51-200	84 contacts →
	Partial evidence “Engage Your Customers; a world leader analytical and customer centric technology company with powerful consulting services.” Source: RevenueBase Database · checked Sep 19, 2026
14	The Marketing Lounge Partnership	Indirect evidence	Lower Stretton, United KingdomHQ checked Sep 19, 2026	51-200	77 contacts →
	Indirect evidence “We are one of the UK’s only combined incentive, loyalty, partnership and CRM agencies – providing the ideas, planning and delivery of campaigns for some of the UK’s biggest…” Source: RevenueBase Database · checked Sep 19, 2026
15	TAP CXM	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	77 contacts →
	Partial evidence “At Tap CXM, we believe businesses do best when they focus on customer experience.” Source: RevenueBase Database · checked Sep 19, 2026
16	HTK An ITA Group Company	Indirect evidence	Ipswich, United KingdomHQ checked Sep 19, 2026	11-50	75 contacts →
	Indirect evidence “HTK is a leading cloud-based (SaaS) software-as-a-service provider, offering innovative data insights, machine learning and loyalty marketing solutions.” Source: RevenueBase Database · checked Sep 19, 2026
17	Voice Marketing LTD	Strong evidence	Sheffield, United KingdomHQ checked Sep 19, 2026	201-500	75 contacts →
	Strong evidence “Voice is an agency that specialises in customer acquisition, development and retention programs.” Source: RevenueBase Database · checked Sep 19, 2026
18	Flourish CRM	Partial evidence	Bristol, United KingdomHQ checked Sep 19, 2026	51-200	70 contacts →
	Partial evidence “Flourish is a specialist Customer Relationship Marketing (CRM) agency based in the UK and Dubai that’s delivering CRM for the real world.” Source: RevenueBase Database · checked Sep 19, 2026
19	The Tecsa Group	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	66 contacts →
	Indirect evidence “Tecsa is a specialist retail loyalty and analytics consultancy founded and led by former retail executives who built and ran major loyalty programmes, including Nectar, Holland &…” Source: RevenueBase Database · checked Sep 19, 2026
20	LTK Consultants LTD	Strong evidence	Park, United KingdomHQ checked Sep 19, 2026	51-200	63 contacts →
	Strong evidence “LTK are a outsourced solutions provider, assisting you to reach your goals through customer retention, sales growth, business & strategy development/ implementation and people…” Source: RevenueBase Database · checked Sep 19, 2026
21	Ponderosa Agency	Indirect evidence	Cross York Street, United KingdomHQ checked Sep 19, 2026	51-200	57 contacts →
	Indirect evidence “Ready for better?” Source: RevenueBase Database · checked Sep 19, 2026
22	Buyapowa	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	52 contacts →
	Indirect evidence “For more than a decade, we’ve been helping enterprise brands rethink how they grow.” Source: RevenueBase Database · checked Sep 19, 2026
23	Engage HUB	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	51-200	49 contacts →
	Partial evidence “Every customer is unique.” Source: RevenueBase Database · checked Sep 19, 2026
24	The Foundation	Partial evidence	London, United KingdomHQ checked Sep 19, 2026	11-50	49 contacts →
	Partial evidence “Since we’ve helped ambitious leaders and organisations create true customer-led success.” Source: RevenueBase Database · checked Sep 19, 2026
25	PDS	Indirect evidence	Wellingborough, United KingdomHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “PDS works with ambitious brands that want to disrupt their industries through growth, innovation and employee engagement.” Source: RevenueBase Database · checked Sep 19, 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: customer retention agencies. 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 customer retention agencies.
Partial evidence: Its own public description names part of customer retention agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name customer retention agencies. 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 764 customer retention agencies based in the United Kingdom

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Customer retention agencies based in the United Kingdom at a glance

As of Sep 19, 2026

37.5%Verified-email coverage

12.8Average contacts per company

1-10Median size (employees)

33.0%Largest-city concentration · London

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

552

11-50

142

51-200

201-500

501-1,000

1,001-5,000

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 764 companies.

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 customer retention agencies, 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 the United Kingdom whose own description of what they do matches “customer retention agencies”. 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 customer retention agencies), 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 customer retention agencies, and records with no verified work email. Companies headquartered outside United Kingdom 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, 3,678 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 19, 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.

Customer retention agencies by metro

Customer retention agencies in London252

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 customer retention agencies, 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 customer retention agencies are there based in the United Kingdom?

RevenueBase identified 764 customer retention agencies headquartered in the 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?

TLC Worldwide, headquartered in London, tops this list with the largest team on record.

Which city has the most customer retention agencies?

London leads with 252 headquartered companies, followed by Manchester (23) and Birmingham (15).

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 3,678 verified decision-maker contacts tracked across these 764 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 19, 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.