Company lists · Data refreshed September 2026

Top 25 Communications consulting firms based in London, United Kingdom

Name: Communications consulting 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 8, 2026 695 companies tracked

RevenueBase identified 695 company matches for communications consulting firms associated with London, United Kingdom as of September 2026 and tracks 8,357 professional contacts across them, including 3,542 with verified work emails and 819 with mobile numbers. Across the United Kingdom, London is the largest hub for this category.

This list covers company matches for communications consulting 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 8, 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 8, 2026 How this list was built

695Companies

8,357Contacts tracked

3,542Verified emails

819Mobile numbers

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The 25 largest communications consulting firms based in London, United Kingdom

Ranked by team size

Top 25 of 695 company matches for communications consulting firms based in London, United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 8, 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	Cartesian	Exact match	London, United KingdomHQ recorded Sep 8, 2026	201-500	302 contacts →
	Exact match “Cartesian is a specialist consulting firm focused on the global telecommunications, media, and technology industries and is now part of Bounteous, an AI services firm helping…” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
2	Portland	Exact match	London, United KingdomHQ recorded Sep 8, 2026	201-500	229 contacts →
	Exact match “Portland is a consultancy specialising in public affairs, corporate affairs and geopolitics.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
3	Radley Yeldar	Exact match	London, United KingdomHQ recorded Sep 8, 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 8, 2026 · View company records in RevenueBase
4	CDR Citigate Dewe Rogerson	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	190 contacts →
	Exact match “CDR is a leading global strategic communications consultancy.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
5	Hanover Communications	Exact match	London, United KingdomHQ recorded Sep 8, 2026	201-500	177 contacts →
	Exact match “Hanover is an award-winning communications consultancy that advises enterprises, institutions, and individuals on rewiring their strategies for long-term success.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
6	Cavendish	Exact match	London, United KingdomHQ recorded Sep 8, 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 8, 2026 · View company records in RevenueBase
7	Milltown Partners	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	174 contacts →
	Exact match “Milltown Partners is a global advisory firm working with influential organisations and individuals on the communications and public policy challenges that define their reputations.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
8	Lansons Team Farner	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	143 contacts →
	Exact match “Organisations and brands turn to us to shape, protect and transform their reputations.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
9	Instinctif Partners	Exact match	London, United KingdomHQ recorded Sep 8, 2026	201-500	130 contacts →
	Exact match “Instinctif UK has officially rebranded to TEAM LEWIS.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
10	Hanbury Strategy	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	125 contacts →
	Exact match “Hanbury is a strategic advisory firm that turns insight into impact.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
11	Copper Consultancy	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	114 contacts →
	Exact match “At Copper, we combine insight, intelligence and creative communications expertise to deliver measurable impact for our clients.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
12	Camargue	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	111 contacts →
	Exact match “Camargue is an award-winning, employee-owned communications agency.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
13	SOH	Exact match	London, United KingdomHQ recorded Sep 8, 2026	11-50	96 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
14	Connect Group	Exact match	London, United KingdomHQ recorded Sep 8, 2026	11-50	89 contacts →
	Exact match “Connect is a communications agency specialising in public affairs and political strategy, corporate communications and reputation management.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
15	PLMR	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	78 contacts →
	Exact match “PLMR delivers Communications with Impact Lobbying and Public Affairs We draw on the experience of former MPs, candidates and advisers, local authority councillors and public…” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
16	Cirkle	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	78 contacts →
	Exact match “At Cirkle, we have 25 years' experience delivering comms.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
17	Madano	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	76 contacts →
	Exact match “Madano is committed to building a better world through intelligent and creative communications supported by in-depth insights.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
18	WA Communications	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	71 contacts →
	Exact match “We are a strategic communications consultancy helping organisations achieve policy and reputational outcomes.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
19	Hawthorn Advisors	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	70 contacts →
	Exact match “Hawthorn Advisors is a leading strategic communications consultancy with international reach.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
20	Tavistock	Exact match	London, United KingdomHQ recorded Sep 8, 2026	11-50	57 contacts →
	Exact match “Tavistock is a leading strategic communications consultancy specialising in the corporate, financial and reputation management sectors.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
21	Burson Buchanan	Exact match	London, United KingdomHQ recorded Sep 8, 2026	11-50	55 contacts →
	Exact match “For more than four decades, we have helped our clients build, protect, and enhance their reputations, advance their business objectives, and shape the conversations that matter…” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
22	Prm-Global	Exact match	London, United KingdomHQ recorded Sep 8, 2026	11-50	54 contacts →
	Exact match “We are the strategic acumen of ‘Gen Plus Group’, a dynamic communications agency where strategy meets storytelling.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
23	London School Of Public Relations	Exact match	London, United KingdomHQ recorded Sep 8, 2026	11-50	54 contacts →
	Exact match “Established in 1992, the London School of Public Relations (LSPR) equips communications professionals with strategic skills through intensive, certified training programs…” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
24	H Advisors Maitland	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	51 contacts →
	Exact match “H/Advisors in the UK brings together the heritage, skills and insight of H/Advisors Maitland and H/Advisors Cicero to support leaders at their most important moments.” Recorded in the RevenueBase company graph · Sep 8, 2026 · View company records in RevenueBase
25	Irvine Partners	Exact match	London, United KingdomHQ recorded Sep 8, 2026	51-200	50 contacts →
	Exact match “We are Irvine Partners Creative Communications.” Recorded in the RevenueBase company graph · Sep 8, 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 “communications consulting 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 695 communications consulting firms based in London, United Kingdom

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Communications consulting firms based in London, United Kingdom at a glance

As of Sep 8, 2026

42.4%Verified-email coverage

9.8%Mobile-number coverage

12.0Average contacts per company

1-10Median size (employees)

Sep 8, 2026Page data refreshed

Companies by employee count

1-10

483

11-50

166

51-200

201-500

501-1,000

Freshness & accuracy

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

Email last verified

Median 11.0d

3,2540–30

27331–60

061–90

090–180

15180+

Company record updated

Median 60.0d

00–30

4,53131–60

2,80361–90

57790–180

446180+

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 “communications consulting 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 3,542 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 8, 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 “communications consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many communications consulting firms are there based in London, United Kingdom?

RevenueBase identified 695 company matches for communications consulting 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?

Cartesian 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 communications consulting firms?

London leads the United Kingdom with 749 company records, followed by Manchester (27) and Bristol (21).

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 3,542 professional contacts with verified work emails tracked across these 695 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 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 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.