Company lists · Data refreshed September 2026

Top 25 Internal communications agencies based in London, United Kingdom

Name: Internal communications agencies based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 598 companies tracked

RevenueBase identified 598 company matches for internal communications agencies associated with London, United Kingdom as of September 2026 and tracks 13,642 professional contacts across them, including 5,108 with verified work emails. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for internal communications agencies 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 20, 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 20, 2026 How this list was built

598Companies

13,642Contacts tracked

5,108Verified emails

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The 25 largest internal communications agencies based in London, United Kingdom

Ranked by team size

Top 25 of 598 company matches for internal communications agencies based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 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	Grayling	Exact match	London, United KingdomHQ recorded Sep 20, 2026	501-1,000	550 contacts →
	Exact match “We are Grayling, the world's local communications agency.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Mullenlowe Global	Exact match	London, United KingdomHQ recorded Sep 20, 2026	1,001-5,000	544 contacts →
	Exact match “Happy to see you came here to learn a little more about us!” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	The7stars	Exact match	London, United KingdomHQ recorded Sep 20, 2026	201-500	295 contacts →
	Exact match “the7stars is the UK’s largest independent media agency, offering the best people, the best service and the best creative media campaigns.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4	Four Agency Worldwide	Exact match	London, United KingdomHQ recorded Sep 20, 2026	201-500	292 contacts →
	Exact match “Four is one of the leading independent integrated communications agencies in the UK and the Middle East.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	M&c Saatchi World Services	Exact match	London, United KingdomHQ recorded Sep 20, 2026	201-500	272 contacts →
	Exact match “M&C Saatchi World Services is an issues-focused communications agency.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6	Brands2life	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	224 contacts →
	Exact match “We’re an award-winning, founder-led, communications agency based in London, Minneapolis, New York and San Francisco with an extensive global capability.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	SMP Group	Exact match	London, United KingdomHQ recorded Sep 20, 2026	201-500	221 contacts →
	Exact match “We are an insight led marketing communications team, delivering leading innovations and experiences that are proven to drive business growth.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	Radley Yeldar	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	198 contacts →
	Exact match “Radley Yeldar is an award-winning, independent London and Birmingham-based creative consultancy with more than 200 communications specialists.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	Cavendish	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	176 contacts →
	Exact match “Helping organisations build and protect value in complex and contested environments.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Havas People	Exact match	London, United KingdomHQ recorded Sep 20, 2026	201-500	170 contacts →
	Exact match “At Havas People we shape meaningful brands for the changing worlds of work and study.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	Havas London	Exact match	London, United KingdomHQ recorded Sep 20, 2026	201-500	157 contacts →
	Exact match “From pigeons to platforms, from news agency to integrated communications services, our story is one of constant reinvention.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	BD Network	Exact match	London, United KingdomHQ recorded Sep 20, 2026	11-50	147 contacts →
	Exact match “We are BD, an independent creative communications agency that’s been delivering Brand Difference for some of the world’s biggest brands since 1990.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Bacchus Agency	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	145 contacts →
	Exact match “Global Creative Communications.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	ART Studio	Exact match	London, United KingdomHQ recorded Sep 20, 2026	11-50	139 contacts →
	Exact match “A communication agency specialising in advertising, public relations, and digital media, Artbees' art studio has been in existence since 2006.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Cognito	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	131 contacts →
	Exact match “Cognito is the global communications agency for finance, technology and the climate transition.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Gallagher Employee Experience & Communication	Exact match	London, United KingdomHQ recorded Sep 20, 2026	10001+	113 contacts →
	Exact match “We are a global internal communication agency on a mission to help people feel different about work.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17	Battenhall	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	112 contacts →
	Exact match “Battenhall is an award-winning communications agency for the social media age.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	Camargue	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	111 contacts →
	Exact match “Camargue is an award-winning, employee-owned communications agency.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	Zinc Network	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	106 contacts →
	Exact match “Zinc Network is a full-service communications agency that helps governments, communities, businesses, and NGOs address some of the most complex issues facing the world today and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	Essencemediacomx	Exact match	London, United KingdomHQ recorded Sep 20, 2026	501-1,000	103 contacts →
	Exact match “EssenceMediacom is GroupM’s newest and largest agency, committed to delivering breakthroughs for brands in the New Communications Economy.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	Aspectus Group	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	102 contacts →
	Exact match “Aspectus is a global brand, marketing and communications agency specializing in technology, financial services, professional services, energy and industrials.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	W Communications	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	100 contacts →
	Exact match “Part of the W Group, W Communications is a fiercely independent social-first communications agency that has united brands with culture to deliver commercial success since 2009.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	John DOE	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	99 contacts →
	Exact match “John Doe is a creative agency that makes the unknown, known.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	The PHA Group	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	92 contacts →
	Exact match “PHA is an award-winning earned-first integrated communications agency.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	LCA	Exact match	London, United KingdomHQ recorded Sep 20, 2026	51-200	90 contacts →
	Exact match “The integrated communications agency for the built environment.” Recorded in the RevenueBase company graph · Sep 20, 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 “internal communications agencies”. 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 598 internal communications agencies based in London, United Kingdom

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Internal communications agencies based in London, United Kingdom at a glance

As of Sep 20, 2026

37.4%Verified-email coverage

22.8Average contacts per company

1-10Median size (employees)

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

304

11-50

204

51-200

201-500

501-1,000

1,001-5,000

10001+

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 598 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 “internal communications agencies” 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 5,108 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 20, 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.

Internal communications agencies by metro in the United Kingdom

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 “internal communications agencies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many internal communications agencies are there based in London, United Kingdom?

RevenueBase identified 598 company matches for internal communications agencies 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?

Grayling 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 internal communications agencies?

London leads the United Kingdom with 598 company records, followed by Manchester (43) and Bristol (32).

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 5,108 professional contacts with verified work emails tracked across these 598 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 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 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.