30 leading Public Relations and Communications Services companies in London (2026 list)

These London-based companies specialize in public relations and communications services, ranging from large established agencies to newer firms. PREMIER focuses on entertainment, arts, and culture communications, while Onclusive offers data-driven PR insights and media monitoring. Nucleus Global specializes in scientific communications, and Grayling is a global communications agency with a wide network.

A notable pattern among these companies is their diverse specializations within the communications sector. For example, PURPLE serves the beauty, fashion, and lifestyle industries, KARLA OTTO focuses on fashion and culture, and Cavendish provides services for the built environment. All listed companies are headquartered in London.

#	Company	Industry	Headquarters	Employees	Founded
1	PREMIER premiercomms.com This company specializes in creative communications for entertainment, arts, and culture through PR, events, partnerships, social media, and experiential marketing	Public Relations and Communications Services	🇬🇧 London	1,449	n/a
2	Onclusive onclusive.com Global PR and Communications partner offering data-driven insights, consultancy, workflow tools, and media monitoring to elevate performance and prove value	Public Relations and Communications Services	🇬🇧 London	1,098	n/a
3	Nucleus Global, an Inizio Company nucleusglobal.com Innovative family-driven company specializing in scientific communications, with a team of experts in medical, digital, creative, and patient engagement for impactful outcomes	Public Relations and Communications Services	🇬🇧 London	696	n/a
4	Piaryum Communication & Media piaryum.com UK-based agency offers media consultancy, planning, marketing, health tourism, event management, production, content creation, and advertising services across the United Kingdom.	Public Relations and Communications Services	🇬🇧 London	680	2019
5	Grayling grayling.com Global communications agency with 32 offices worldwide and affiliate network, leveraging insights, influencers, cultures, and communities to create client advantage	Public Relations and Communications Services	🇬🇧 London	534	n/a
6	PURPLE purplepr.com A boutique PR agency specializing in press relations, editorial procurement, product placement, and event management for beauty, fashion, lifestyle, and entertainment industries	Public Relations and Communications Services	🇬🇧 London	529	1997
7	KARLA OTTO karlaotto.com Full-service brand-building agency offering strategy, creative, talent, experiences, and communication services across fashion, beauty, design, lifestyle, and culture.	Public Relations and Communications Services	🇬🇧 London	508	1982
8	Portland portland-communications.com Portland provides strategic counsel and execution by leveraging expertise in politics, media, digital campaigns, branding, and PR to drive impactful communication	Public Relations and Communications Services	🇬🇧 London	399	2001
9	Frank welcometofrank.com This creative agency with offices in London, Manchester, and Sydney generates buzz through insight-led campaigns, focusing on great ideas to drive conversations	Public Relations and Communications Services	🇬🇧 London	367	2000
10	Harvard harvard.co.uk New PR and communications powerhouse from VCCP. Integrates market leaders in consumer, corporate, technology, and financial services for commercial value.	Public Relations and Communications Services	🇬🇧 London	342	2025
11	Communication Workers Union cwu.org Representing nearly 200,000 members in the UK communications industry, with expertise in engineering, technology, finance, and manual skills Join us today	Public Relations and Communications Services	🇬🇧 London	331	n/a
12	SCIRIS sciris.com SCIRIS is a global communications and consultancy firm, uniting diverse expertise to deliver innovative healthcare solutions inspired by science	Public Relations and Communications Services	🇬🇧 London	311	n/a
13	MHP Group mhpgroup.com An integrated communications agency specializing in applying behavioral science to solve complex challenges across various sectors and disciplines Trusted by leading businesses worldwide	Public Relations and Communications Services	🇬🇧 London	266	2010
14	Cavendish cavendishconsulting.com Specialist communications consultancy providing expert counsel and services for the built environment, offering public affairs, planning, PR, marketing to maximize opportunities and reduce risk	Public Relations and Communications Services	🇬🇧 London	246	n/a
15	Sutton suttoncomms.com International agency specializing in strategic communications, marketing, and partnerships for visual arts, performing arts, design, and cultural enterprises worldwide.	Public Relations and Communications Services	🇬🇧 London	239	2006
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16	CDR (Citigate Dewe Rogerson)cdrconsultancy.com Global consultancy providing strategic communications and reputation management services, partnering with companies, organizations, and individuals for trusted advice.	Public Relations and Communications Services	🇬🇧 London	228	1987
17	Camargue camargue.uk An award-winning employee-owned communications agency offering strategic advice, creative campaigns, and reputation management for businesses across various sectors	Public Relations and Communications Services	🇬🇧 London	187	1987
18	Camron camronglobal.com This company advocates for the impact of design in businesses, works with top designers, and extends its reach into urban planning globally	Public Relations and Communications Services	🇬🇧 London	186	1989
19	Milltown Partners milltownpartners.com advises influential organizations and individuals on communications and public policy challenges, shaping reputations with data-driven strategies and global expertise.	Public Relations and Communications Services	🇬🇧 London	182	2013
20	John Doe johndoehub.com A creative agency specializing in building memorable brands by sparking honest conversations and grounding campaigns in emotion and truth	Public Relations and Communications Services	🇬🇧 London	181	2009
21	Lexington lexcomm.co.uk A leading independent strategic consultancy delivering positive change to shape the future for global businesses, organizations, and society	Public Relations and Communications Services	🇬🇧 London	163	1998
22	Hanbury Strategy hanburystrategy.com Strategic advisory firm specializing in turning insight into impact through campaigns addressing communications, public opinion, and policy challenges for global brands	Public Relations and Communications Services	🇬🇧 London	150	2016
23	Hanover Communications hanovercomms.com Award-winning consultancy advising on communication strategies for long-term success through insight, narrative shaping, influencer engagement, campaign activation, regulation navigation, and market access	Public Relations and Communications Services	🇬🇧 London	146	1998
24	Bacchus Agency bacchus.agency Specializing in brand development, creative communications, content creation, and strategic partnerships, this agency offers a range of services for global campaigns	Public Relations and Communications Services	🇬🇧 London	142	1998
25	Connect Group connectpa.co.uk Specialists in public affairs and political strategy, delivering corporate communications and reputation management for prestigious UK organisations to achieve outstanding results.	Public Relations and Communications Services	🇬🇧 London	133	n/a
26	Roxhill Media roxhillmedia.com Provides AI-driven media intelligence platform offering monitoring, database, analytics, bespoke analysis, and journalist events for PR professionals.	Public Relations and Communications Services	🇬🇧 London	117	2013
27	LCA thisislca.com A full-service PR consultancy specializing in campaigns, consultations, and content for the built environment sector, creating long-term value for clients	Public Relations and Communications Services	🇬🇧 London	112	1999
28	PRCO Group prco.com Global marketing and communications agency specializing in travel, real estate, and luxury lifestyle sectors Offering integrated solutions through strategic campaigns and media relationships	Public Relations and Communications Services	🇬🇧 London	98	1987
29	Fight or Flight fightorflight.com A creative communications agency specializing in helping B2B brands stand out with unique PR, social, and branded content campaigns	Public Relations and Communications Services	🇬🇧 London	96	2020
30	W Communications wcommunications.co.uk An award-winning UK creative agency specializing in earned media, social, and digital services for global brands, innovators, and start-ups	Public Relations and Communications Services	🇬🇧 London	86	2009

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Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 15, 2026.

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Public Relations and Communications Services companies in the United Kingdom 83

30 leading Public Relations and Communications Services companies in London

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