Company lists · Data refreshed September 2026

Top 25 Professional services pr agencies based in London, United Kingdom

Name: Professional services pr 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 21, 2026 669 companies tracked

RevenueBase identified 669 professional services pr agencies headquartered in London, United Kingdom as of September 2026 and tracks 7,971 professional contacts across them, including 2,393 with verified work emails. London is the largest hub.

This list covers professional services pr agencies headquartered in London, 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 21, 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 21, 2026 86% judged on-target in blind review

669Companies

7,971Contacts tracked

2,393Verified emails

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The 25 largest professional services pr agencies based in London, United Kingdom

Ranked by team size

Top 25 of 669 professional services pr agencies based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to professional services pr 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	Purple	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	449 contacts →
	Indirect evidence “Purple is independent in philosophy, attitude and operation –offering a boutique in-house approach, the strategic requirements of each client are individually tailored from the…” Source: RevenueBase Database · checked Sep 21, 2026
2	Four Agency Worldwide	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	292 contacts →
	Indirect evidence “Four is one of the leading independent integrated communications agencies in the UK and the Middle East.” Source: RevenueBase Database · checked Sep 21, 2026
3	Harvard	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	213 contacts →
	Partial evidence “Harvard is an award-winning integrated Marketing and PR agency for tech brands big and small, with a full-service offering including: media and analyst relations, marketing…” Source: RevenueBase Database · checked Sep 21, 2026
4	The Romans	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	201-500	187 contacts →
	Partial evidence “We’re bored of boring PR.” Source: RevenueBase Database · checked Sep 21, 2026
5	Camargue	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	111 contacts →
	Indirect evidence “Camargue is an award-winning, employee-owned communications agency.” Source: RevenueBase Database · checked Sep 21, 2026
6	Connect Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	89 contacts →
	Indirect evidence “Connect is a communications agency specialising in public affairs and political strategy, corporate communications and reputation management.” Source: RevenueBase Database · checked Sep 21, 2026
7	PLMR	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	78 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
8	Camron	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	74 contacts →
	Partial evidence “A global PR, communications and brand strategy consultancy positioning the world’s leading brands at the forefront of modern culture with offices in London, New York, Los Angeles…” Source: RevenueBase Database · checked Sep 21, 2026
9	Prco Group	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	51-200	72 contacts →
	Indirect evidence “PRCO is a consultancy-first communications agency for the world’s foremost luxury brands in real estate, hospitality and lifestyle.” Source: RevenueBase Database · checked Sep 21, 2026
10	Burson Buchanan	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	55 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 21, 2026
11	Prm-Global	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	54 contacts →
	Indirect evidence “We are the strategic acumen of ‘Gen Plus Group’, a dynamic communications agency where strategy meets storytelling.” Source: RevenueBase Database · checked Sep 21, 2026
12	Pagefield	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	49 contacts →
	Indirect evidence “Pagefield is an independent communications consultancy specialising in integrated campaigning, public affairs and corporate and brand communications.” Source: RevenueBase Database · checked Sep 21, 2026
13	Camarco	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	49 contacts →
	Indirect evidence “We provide financial and corporate communications advice to help our clients succeed.” Source: RevenueBase Database · checked Sep 21, 2026
14	COW	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	49 contacts →
	Indirect evidence “We create things that get you talked about.” Source: RevenueBase Database · checked Sep 21, 2026
15	Rooster	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	43 contacts →
	Partial evidence “Rooster is an award-winning independent PR & communications agency with a focus on innovative storytelling, performance and accountability.” Source: RevenueBase Database · checked Sep 21, 2026
16	Firefly Communications	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	43 contacts →
	Partial evidence “Firefly Communications is a pan-European public relations agency that is shaping reputations by offering PR and digital communications services for firms that thrive on technology.” Source: RevenueBase Database · checked Sep 21, 2026
17	Mercieca	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	41 contacts →
	Indirect evidence “We’re Mercieca.” Source: RevenueBase Database · checked Sep 21, 2026
18	Storm Communications	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	41 contacts →
	Indirect evidence “Drop us a line at hello@stormcom.co.uk to sign up to our Consumer Brands or Corporate newsletter** Storm is a hardworking, down-to-earth, friendly and results-driven agency.” Source: RevenueBase Database · checked Sep 21, 2026
19	Greenbrook	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	40 contacts →
	Indirect evidence “Greenbrook is an independent strategic communications firm that advises clients on all aspects of their business through the lens of reputation.” Source: RevenueBase Database · checked Sep 21, 2026
20	Sauce Communications	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	40 contacts →
	Partial evidence “Sauce Communications is one of the UK's leading PR, social media and digital marketing agencies specialising in restaurants, food and drink brands, bars and hotels.” Source: RevenueBase Database · checked Sep 21, 2026
21	Drofa Comms	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	39 contacts →
	Partial evidence “Drofa Comms is a global PR consulting agency proudly representing the leading finance and fintech firms.” Source: RevenueBase Database · checked Sep 21, 2026
22	Firstlight	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	36 contacts →
	Partial evidence “firstlight group is an independent corporate and B2B communications consultancy, ranked among PR Week UK's top 25 corporate agencies for 2025.” Source: RevenueBase Database · checked Sep 21, 2026
23	LM Communications	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Indirect evidence “LM-Communications is renowned for its personalised approach and adeptness at delivering meaningful results with a global impact.” Source: RevenueBase Database · checked Sep 21, 2026
24	FOX Communications	Indirect evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	35 contacts →
	Indirect evidence “At Fox Communications, our best practice merges solid thinking with an adaptability that reflects an ever-changing digital landscape.” Source: RevenueBase Database · checked Sep 21, 2026
25	Rostrum	Partial evidence	London, United KingdomHQ checked Sep 21, 2026	11-50	34 contacts →
	Partial evidence “Rostrum is a leading London PR agency.” Source: RevenueBase Database · checked Sep 21, 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: professional services pr 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 professional services pr agencies.
Partial evidence: Its own public description names part of professional services pr agencies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name professional services pr 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 669 professional services pr agencies based in London, United Kingdom

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Professional services pr agencies based in London, United Kingdom at a glance

As of Sep 21, 2026

30.0%Verified-email coverage

11.9Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

469

11-50

171

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 669 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 professional services pr 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 London, United Kingdom whose own description of what they do matches “professional services pr 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 professional services pr 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 professional services pr agencies, and records with no verified work email. Companies headquartered outside London 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, 2,393 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 21, 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.

Professional services pr agencies by metro in the United Kingdom

Professional services pr agencies in London669
Professional services pr agencies in Manchester46
Professional services pr agencies in Leeds26

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 professional services pr 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 professional services pr agencies are there based in London, United Kingdom?

RevenueBase identified 669 professional services pr agencies headquartered in London, 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?

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

Which city has the most professional services pr agencies?

London leads with 669 headquartered companies, followed by Manchester (46) and Leeds (26).

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 2,393 verified decision-maker contacts tracked across these 669 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 21, 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.