Company lists · Data refreshed September 2026

Top 24 Internal communications firms based in the United Kingdom

Name: Internal communications firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,341 companies tracked

RevenueBase identified 1,341 internal communications firms headquartered in the United Kingdom as of September 2026 and tracks 14,781 professional contacts across them, including 6,296 with verified work emails. London is the largest hub.

This list covers internal communications firms 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 20, 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 20, 2026 86% judged on-target in blind review

1,341Companies

14,781Contacts tracked

6,296Verified emails

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The 24 largest internal communications firms based in the United Kingdom

Ranked by team size

Top 24 of 1,341 internal communications firms based in the United Kingdom, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to internal communications firms: 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	Emperor	Partial evidence	Aldgate, United KingdomHQ checked Sep 20, 2026	201-500	415 contacts →
	Partial evidence “Emperor is one of the UK's leading employee-owned creative communications agencies.” Source: RevenueBase Database · checked Sep 20, 2026
2	Four Agency Worldwide	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	292 contacts →
	Partial evidence “Four is one of the leading independent integrated communications agencies in the UK and the Middle East.” Source: RevenueBase Database · checked Sep 20, 2026
3	Interact Software	Indirect evidence	Manchester, United KingdomHQ checked Sep 20, 2026	201-500	251 contacts →
	Indirect evidence “Interact delivers enterprise-grade intranet software to over customers and millions of employees worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
4	Brands2life	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	224 contacts →
	Partial evidence “We’re an award-winning, founder-led, communications agency based in London, Minneapolis, New York and San Francisco with an extensive global capability.” Source: RevenueBase Database · checked Sep 20, 2026
5	Headland	Partial evidence	City Of London, United KingdomHQ checked Sep 20, 2026	51-200	205 contacts →
	Partial evidence “We are a communications consultancy powered by collaboration.” Source: RevenueBase Database · checked Sep 20, 2026
6	Radley Yeldar	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	198 contacts →
	Partial evidence “Radley Yeldar is an award-winning, independent London and Birmingham-based creative consultancy with more than 200 communications specialists.” Source: RevenueBase Database · checked Sep 20, 2026
7	Hanover Communications	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	177 contacts →
	Partial evidence “Hanover is an award-winning communications consultancy that advises enterprises, institutions, and individuals on rewiring their strategies for long-term success.” Source: RevenueBase Database · checked Sep 20, 2026
8	Cavendish	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	176 contacts →
	Indirect evidence “Helping organisations build and protect value in complex and contested environments.” Source: RevenueBase Database · checked Sep 20, 2026
9	Havas People	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	201-500	170 contacts →
	Indirect evidence “At Havas People we shape meaningful brands for the changing worlds of work and study.” Source: RevenueBase Database · checked Sep 20, 2026
10	H&h Agency	Strong evidence	Hessle, United KingdomHQ checked Sep 20, 2026	n/a	159 contacts →
	Strong evidence “H&H - The UK’s leading Internal Communications and Employee Engagement agency Every day we throw our collective energy, knowledge and creativity into improving the way people…” Source: RevenueBase Database · checked Sep 20, 2026
11	ART Studio	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	139 contacts →
	Partial evidence “A communication agency specialising in advertising, public relations, and digital media, Artbees' art studio has been in existence since 2006.” Source: RevenueBase Database · checked Sep 20, 2026
12	Citypress	Partial evidence	Manchester, United KingdomHQ checked Sep 20, 2026	51-200	133 contacts →
	Partial evidence “Citypress is one of the UK’s leading communications agencies and we’re proud to represent some of the country’s biggest and best-loved brands.” Source: RevenueBase Database · checked Sep 20, 2026
13	Ceres PR	Indirect evidence	Reading, United KingdomHQ checked Sep 20, 2026	11-50	132 contacts →
	Indirect evidence “Our 360º PR approach ensures consistency of message and brand ethos across all activity – from earned, to owned and paid channels - to help you achieve your business goals.” Source: RevenueBase Database · checked Sep 20, 2026
14	Cognito	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	131 contacts →
	Partial evidence “Cognito is the global communications agency for finance, technology and the climate transition.” Source: RevenueBase Database · checked Sep 20, 2026
15	BIG Partnership	Partial evidence	Glasgow, United KingdomHQ checked Sep 20, 2026	51-200	128 contacts →
	Partial evidence “BIG is an independent, integrated communications agency making brands unmissable through joined-up thinking across PR, creative and digital to deliver long-term impact and value.” Source: RevenueBase Database · checked Sep 20, 2026
16	Gallagher Employee Experience & Communication	Strong evidence	London, United KingdomHQ checked Sep 20, 2026	10001+	113 contacts →
	Strong evidence “We are a global internal communication agency on a mission to help people feel different about work.” Source: RevenueBase Database · checked Sep 20, 2026
17	Camargue	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	111 contacts →
	Partial evidence “Camargue is an award-winning, employee-owned communications agency.” Source: RevenueBase Database · checked Sep 20, 2026
18	Edison Group	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	104 contacts →
	Partial evidence “Edison Group is a global investor relations and communications business dedicated to helping companies connect with the right investors.” Source: RevenueBase Database · checked Sep 20, 2026
19	JBP	Partial evidence	Bristol, United KingdomHQ checked Sep 20, 2026	11-50	101 contacts →
	Partial evidence “We're JBP, an award-winning full-service communications agency with our headquarters in Bristol, and offices in London, Warwick, Manchester and Cardiff.” Source: RevenueBase Database · checked Sep 20, 2026
20	SOH	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	96 contacts →
	Partial evidence “We’re service communication experts – using a mix of science, creativity and service know-how to improve how you talk with your customers through all channels and media, from…” Source: RevenueBase Database · checked Sep 20, 2026
21	The PHA Group	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	92 contacts →
	Partial evidence “PHA is an award-winning earned-first integrated communications agency.” Source: RevenueBase Database · checked Sep 20, 2026
22	LCA	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	90 contacts →
	Partial evidence “The integrated communications agency for the built environment.” Source: RevenueBase Database · checked Sep 20, 2026
23	Connect Group	Partial evidence	London, United KingdomHQ checked Sep 20, 2026	11-50	89 contacts →
	Partial evidence “Connect is a communications agency specialising in public affairs and political strategy, corporate communications and reputation management.” Source: RevenueBase Database · checked Sep 20, 2026
24	Cirkle	Indirect evidence	London, United KingdomHQ checked Sep 20, 2026	51-200	78 contacts →
	Indirect evidence “At Cirkle, we have 25 years' experience delivering comms.” Source: RevenueBase Database · checked Sep 20, 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: internal communications firms. 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 internal communications firms.
Partial evidence: Its own public description names part of internal communications firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name internal communications firms. 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 24 of 1,341 internal communications firms based in the United Kingdom

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Internal communications firms based in the United Kingdom at a glance

As of Sep 20, 2026

42.6%Verified-email coverage

11.0Average contacts per company

1-10Median size (employees)

43.2%Largest-city concentration · London

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

946

11-50

313

51-200

201-500

501-1,000

1,001-5,000

10001+

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 1,341 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 internal communications firms, 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 “internal communications firms”. 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 internal communications firms), 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 internal communications firms, 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, 6,296 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 20, 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.

Internal communications firms by metro

Internal communications firms in London579
Internal communications firms in Manchester38

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 internal communications firms, 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 internal communications firms are there based in the United Kingdom?

RevenueBase identified 1,341 internal communications firms 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?

Emperor, headquartered in Aldgate, tops this list with the largest team on record.

Which city has the most internal communications firms?

London leads with 579 headquartered companies, followed by Manchester (38) and Bristol (22).

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 6,296 verified decision-maker contacts tracked across these 1,341 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 20, 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.