Best 10 Paid Media Agencies in London

TL;DR: London’s top paid media agencies combine Google Ads, Meta, LinkedIn, and programmatic expertise under one roof. The best performers for multi-channel campaigns include Found, ROAST, Croud, and Jellyfish for enterprise brands, while Favoured and The Good Marketer serve SMEs well. Expect monthly retainers from £2,000 to £25,000+ depending on scope.

I’ve spent the past three years watching London businesses burn through ad budgets with the wrong agency partners. The pattern is always the same. They hire a specialist who excels at Google Ads but can’t coordinate a Facebook retargeting sequence. Or they pick a full-service shop where paid media is an afterthought handled by junior staff.

A paid media agency London businesses actually need does something different. They build campaigns where each channel reinforces the others. Your YouTube pre-roll warms up prospects. Your search ads capture intent. Your LinkedIn ads reach decision-makers. Your programmatic display handles retargeting. Everything connects.

What Makes a Paid Media Agency Worth Hiring?

A paid media agency worth hiring demonstrates measurable ROI across multiple advertising platforms while maintaining transparent reporting and strategic flexibility. According to industry research from the Internet Advertising Bureau UK, businesses working with specialist paid media partners see 23% higher return on ad spend compared to in-house management alone.

The difference comes down to three factors: platform expertise, cross-channel attribution, and buying power. Agencies managing millions in monthly spend get better rates, earlier access to beta features, and dedicated platform representatives.

Key Services to Look For

How Much Do London Paid Media Agencies Charge?

London paid media agencies typically charge either a percentage of ad spend (10-20%), a flat monthly retainer (£2,000-£25,000+), or a hybrid model combining both. According to data from UK agency surveys, the median retainer for SME campaigns sits around £3,500 monthly, excluding ad spend.

One caveat worth mentioning: the cheapest option rarely delivers the best results. I’ve seen businesses save £1,000 monthly on fees only to waste £15,000 on poorly optimised campaigns. The maths doesn’t work.

Found: Data-Led Performance Marketing

Found has built a reputation for combining paid media with organic search and analytics under one unified strategy. Their multi-channel campaigns typically span Google Ads, Meta, and programmatic, with strong emphasis on first-party data integration.

They work primarily with mid-market and enterprise brands. If you’re spending under £10,000 monthly on ads, you’ll likely find their approach overkill for your needs. For larger budgets, their attribution modelling capabilities justify the premium pricing.

ROAST: Creative Performance Specialists

ROAST positions itself at the intersection of media buying and creative production. What separates them from pure performance shops is their in-house creative team producing ad variations for testing at scale.

Their specialism in app marketing and mobile-first campaigns makes them particularly relevant for brands targeting younger demographics. They’re less suited to B2B or traditional lead generation work.

How Do I Choose Between Specialist and Full-Service Agencies?

Choose a specialist paid media agency if advertising represents your primary growth channel and you need deep platform expertise. Choose a full-service agency if you need integrated campaigns spanning creative, media, and strategy under unified account management.

Most businesses spending £5,000-£50,000 monthly on ads benefit from specialists. Above that threshold, full-service offerings from agencies like Jellyfish or Croud provide economies of scale.

Croud: Scalable Enterprise Performance

Croud operates a distributed model using vetted freelance specialists called “Croudies” alongside permanent staff. This structure lets them scale campaigns rapidly without the overhead of traditional agencies.

Their enterprise clients include major retail and finance brands. The trade-off is less hands-on attention for smaller accounts. If you’re not spending at least £20,000 monthly, you might feel like a small fish.

Favoured: App Marketing Excellence

Favoured has carved out a niche in mobile app marketing, combining user acquisition with retention strategies. Their multi-channel approach spans Apple Search Ads, Google UAC, Meta, TikTok, and influencer partnerships.

For app-based businesses, this specialism matters. Generic paid media agencies often lack the technical understanding of attribution windows, SKAdNetwork limitations, and lifetime value modelling specific to mobile.

What Questions Should I Ask a Paid Media Agency?

Ask potential paid media agencies about their reporting frequency, attribution methodology, fee structure transparency, and specific experience in your industry vertical. According to research from the Advertising Association, 67% of client-agency relationships fail due to misaligned expectations set during onboarding.

Here are the questions that actually reveal agency quality:

1. What percentage of your team holds current platform certifications?
2. How do you handle cross-channel attribution when tracking breaks?
3. Can you share anonymised case studies from my industry?
4. What’s your process when campaigns underperform targets?
5. Who specifically will manage my account day-to-day?

The Good Marketer: SME-Friendly Approach

The Good Marketer focuses on small and medium businesses, offering multi-channel paid media without enterprise-level minimum spends. Their retainers start lower than most competitors, making them accessible for businesses testing agency partnerships for the first time.

The limitation is capacity. With smaller teams, response times during busy periods can stretch. For brands needing rapid iteration or complex campaigns, this matters.

Jellyfish: Global Capability, London Roots

Jellyfish has grown from a London startup into a global digital partner working with Google, Meta, and Amazon at the highest certification levels. Their training division means staff stay current on platform changes faster than most competitors.

They’re best suited for multi-market campaigns requiring coordination across countries and languages. Single-market UK campaigns might not need their global infrastructure.

How Long Before Paid Media Campaigns Show Results?

Paid media campaigns typically show initial performance signals within 2-4 weeks, with meaningful optimisation requiring 8-12 weeks of data. According to Google’s own benchmarks, machine learning algorithms in Smart Bidding need approximately 30-50 conversions per month to reach stable performance.

I’ve watched brands pull the plug at week three, convinced campaigns weren’t working. They missed the inflection point that comes once algorithms learn from initial data. Patience isn’t optional in paid media.

Impression: Integrated Search and Paid

Impression combines paid media with SEO, digital PR, and analytics services. Their Nottingham headquarters with London presence gives them access to both talent pools while maintaining lower overheads than pure London agencies.

Their B2B expertise stands out. If you’re running lead generation campaigns for professional services or SaaS products, their experience in longer sales cycles proves valuable.

Passion Digital: Boutique Multi-Channel Expertise

Passion Digital operates as a boutique agency with a broad service range spanning PPC, paid social, SEO, and content. Their size means senior staff remain involved in campaign execution rather than delegating to juniors.

For brands wanting strategic input alongside tactical delivery, this structure works well. Larger agencies often separate these functions, creating communication gaps.

What’s the Difference Between PPC and Paid Media?

PPC (pay-per-click) refers specifically to search advertising where you pay per click, while paid media encompasses all paid advertising including display, social, video, and programmatic formats with various pricing models like CPM and CPA.

Agencies calling themselves “PPC agencies” often handle Google and Microsoft Ads only. Paid media agencies like Greenlight Digital manage campaigns across 10+ platforms simultaneously.

Making Your Final Decision

The right paid media agency London match depends on your budget, industry, and growth stage. Enterprise brands benefit from Croud and Jellyfish’s scale. Growing ecommerce businesses fit well with Found and ROAST. SMEs get value from The Good Marketer and Passion Digital.

Request proposals from three agencies minimum. Compare not just pricing but team structure, reporting samples, and client references. The discovery process reveals more than any website ever could.

Key Takeaways

1. Multi-channel paid media requires agencies with genuine platform breadth, not just Google Ads bolted onto other services.
2. Budget alignment matters more than agency prestige. Don’t hire an enterprise shop for SME spend levels.
3. Allow 8-12 weeks for meaningful optimisation before judging campaign performance.
4. Verify who will actually manage your account day-to-day, not just who attends pitch meetings.
5. Transparent fee structures and attribution reporting separate professional agencies from amateur operations.