Media Buying agencies in London.
Media Buying is the discipline of planning and purchasing paid media across channels (TV, OOH, print, radio, cinema, digital, programmatic, retail media) on behalf of an advertiser. It is distinct from PPC (search), Paid Social (Meta/TikTok/LinkedIn), and Programmatic (DSP-led automated buying), all of which usually sit inside a fuller media plan rather than alongside it. This page shows every agency on AgencyIndex offering media buying in London.
- 16 UK agencies offering media buying in London
- Part of the Media Buying service set
- Indexed in London
- Reviewed 17 May 2026

UM UK, a London-based agency, provides a holistic suite of media and marketing solutions designed to future-proof business operations. With expertise in harnessing cutting-edge business analytics and real-time insights, they drive growth and enrich the customer experience through content and connections deeply anchored in cultural understanding. Distinctive for their commitment to diversity, fairn

As a leading agency based in London, KINESSO provides innovative, technology-driven performance marketing solutions designed to achieve tangible business results. Our core services encompass Consulting, Data & Tech, Media, Experience, and Content. We leverage advanced automation, AI capabilities, and first-party data to enhance and optimise the connection between brands and their target audiences.

Zenith is a London-based agency providing a robust array of advertising and marketing solutions. As an integral part of our services, we specialise in media planning and procurement, online marketing, and data analytics, all designed to enhance brand communication strategies. Our distinctive advantage at Zenith is our dedication to utilising data-led insights to craft innovative and high-impact ma

OMD is a London-based agency delivering a broad range of media services, with a focus on harnessing data-driven insights to expedite superior decision-making for clients. Their key services encompass digital, data, and content capabilities, all anchored by their bespoke Act Fast Framework, designed for rapid adaptation in response to market fluctuations. OMD sets itself apart with a human-centred

Hearts & Science is a London-based marketing agency specialising in forging meaningful, large-scale emotional bonds via ground-breaking media strategies. Core services encompass media planning, data analytics, and consumer insights, devised to seize attention in a progressively segmented media environment. The agency's distinct selling point is their aptitude to remodel media strategies, nurturing

Digitas, a London-based agency, specialises in a comprehensive suite of digital marketing solutions, concentrating on forging impactful relationships via inventive campaigns and platforms. Their core services encompass campaign creation, app development, and digital strategy, as illustrated by projects such as the OREO Press Play campaign and the Official Glastonbury 2022 App. Digitas' distinctive

Epsilon is a London-based agency specialising in an all-inclusive range of marketing services, with a focus on retail media, digital marketing and customer engagement. Their flagship offerings include Epsilon Retail Media, an AI-powered, person-first solution designed to boost shopper loyalty, and Epsilon PeopleCloud, a platform that tailors customer journeys for unparalleled marketing efficacy. E

PHD Media, a London-based agency, specialises in strategic communications and media planning services. They excel in media purchasing, digital marketing, and data analytics, all geared towards helping brands connect efficiently with their desired audiences. PHD Media's unique selling point is their innovative use of data-driven insights to craft powerful campaigns. They predominantly serve sectors

Mediahub, a London-based agency, specialises in strategic media planning and buying, merging human insight with data-led strategies. Their core services encompass the creation of media strategies, cross-channel media procurement, and bespoke advertising solutions, customised to align with each client's unique requirements. What sets Mediahub apart is their emphasis on integrating human expertise w

Performics is a London-based agency specialising in holistic performance marketing strategies designed to optimise business results throughout the complete customer decision journey. The firm's core services encompass performance media, content generation, strategic planning and insights, along with analytics and technology solutions. The unique selling point of Performics lies in their intent-dri

Spark Foundry, a London-based agency, delivers an extensive assortment of media and marketing solutions, tailored to expedite business expansion. They specialise in areas such as media strategising and procurement, data and technological innovation, analytics and insights, e-commerce, CRM, consumer marketing, and marketplace intelligence. Spark Foundry's unique selling point is their proficiency i

Saatchi & Saatchi, a prominent agency based in London, specialises in providing inventive marketing and advertising services. They excel in crafting compelling campaigns for renowned brands such as Waitrose, John Lewis, and EE, with a primary focus on narrative-driven consumer engagement. The agency's unique selling point centres on their dedication to inclusivity within the industry, demonstrated

Essence Global, a London-based agency, provides data-informed, digital-centric media solutions. Recognised for its proficiency in leveraging analytics and technology, the agency excels in crafting bespoke advertising strategies across diverse platforms. Essence Global aids brands in enhancing their media investment for optimal efficiency and significant impact. Serving a broad spectrum of sectors,

We’re the brains behind the brands, without the bloat. No neon signs. No ping-pong tables. No senior team pitching you just to hand it over to the juniors. Just bold ideas, brutal honesty, and big-brand brains without the big agency ego.

The B2B Growth Agency Predictable pipeline growth is a constant challenge for B2B marketing teams. It starts with better MQLs, stronger SQL conversion, and efficient customer acquisition. That’s where Overdrive comes in.

Simplicity Media is an award winning advertising agency that specialises in data driven digital marketing. Our aim is to be your competitive advantage; maximising budgets to provide full funnel success, driving awareness, consideration and purchasing intent across (but not limited too) all digital led mediums. Social Media (TikTok, Instagram, Snapchat, Facebook, Reddit, YouTube et al) Paid Search
AgencyIndex tracks 16 media buying agencies in London. The list above is filtered to that intersection and ordered with verified and featured listings first.
For the wider editor's view on media buying agencies in the UK, see the media buying service brief. For context on London's marketing cluster, see the London location brief. The pricing, timeline and red-flag notes below apply to media buying as a discipline; they do not change materially in London.
Independent media agencies: SME cross-channel £2,000-7,500/mo · mid-market £7,500-20,000/mo · larger accounts £15,000-30,000+/mo. Holding-group networks: meaningful retained support £10,000-30,000+/mo · multi-channel enterprise £25,000-100,000+/mo. Commission models: typically 5-15% of spend on larger or execution-led accounts, 10-20% on smaller accounts. Hybrid (base retainer plus % above a threshold) is now the most common 2026 model. Trading desk / execution-only fees usually layered on top.
1-3wk brief, audience and KPI definition, initial channel hypothesis · 1-2wk plan refinement and stakeholder approval · 1-3wk trading and setup (IOs, programmatic builds, tracking, creative trafficking) · launch within days of final sign-off. First pacing read 1-2 weeks post-launch, first formal optimisation report 2-4 weeks in. Always-on cadence: daily delivery checks, weekly optimisation, monthly business review, quarterly planning reset. Complex enterprise or multi-channel launches run 8-12+ weeks.
- · Will not state in writing whether the agency acts as agent or principal on each channel, or refuses to disclose principal-trading margin
- · No AVB / rebate / vendor incentive clause in the contract, or wording that lets the agency retain undisclosed media-owner rebates
- · No audit rights for the advertiser, including no access to invoices, supply-path data, or holding-company-level rebate records
- · Digital supply chain (DSP, SSP, data, verification, trading desk fees) not separated from media cost in reporting
- · Reluctant to commit to ISBA Framework Agreement principles or IPA contract recommendations as a baseline
- · Pure percentage-of-spend pricing with no flat-fee or hybrid option, and no commitment to outcome metrics alongside delivery
- · Trading desk or proprietary inventory recommended as default without an independent benchmark
Media Buying agencies in other cities.
Other services in London.
What brands ask about media buying agencies.
The 5 questions our editors get most often, answered honestly. These apply to media buying as a discipline regardless of city.