Disclosure and Criteria
Kiin is a London LinkedIn Ads agency and appears on this list. Stated up front, because most agency roundups are published by someone with an interest and do not mention it.
Scored on: LinkedIn specialisation, measurement honesty (landing page clicks versus total clicks), funnel coverage, pricing transparency, and verifiable credentials. Not scored on agency size, awards, or website quality.
LinkedIn Specialists
1. Kiin — best for deep LinkedIn expertise plus GTM outbound
167-169 Great Portland Street, W1W. Team of 8. £2,500–£9,500/month, published.
Three ex-LinkedIn Marketing Solutions employees on an eight-person team. LinkedIn Agency Partner with Marketing API Standard tier, and the only agency running its own LinkedIn Ads MCP server, benchmarking against 1,000+ accounts.
London clients include Lead Forensics (Mayfair) and Sova Assessment (Pimlico). The differentiator is running LinkedIn Ads and signal-based outbound off one dataset rather than as separate channels paying twice for the same audience.
Where we are wrong for you: under £2,000/month spend, transactional products, or if you need one agency across five channels. We go deep on B2B and mostly on LinkedIn.
2. Fill My Funnel — best for focused B2B lead generation
UK. LinkedIn-first. Pricing on enquiry.
Positions as the UK's leading B2B LinkedIn agency, trusted by 75+ brands. Genuinely LinkedIn-first rather than a generalist with a LinkedIn page. Strong on campaign build, targeting and optimisation.
Consider them if you want experienced LinkedIn lead generation without an outbound layer. Weakness: pricing is not published and the offer is narrower than a full GTM engagement.
Full-Service London Agencies
All of these run LinkedIn competently as part of a wider paid media practice. For some companies that is the better answer.
Found
Established London paid media agency with a dedicated LinkedIn advertising practice. Strong choice if you want LinkedIn inside a broader performance relationship with real scale behind it.
Passion Digital
London full-service digital agency that also publishes a well-regarded annual roundup of London LinkedIn agencies. Good breadth; LinkedIn depth is naturally lower than at a specialist, which is the tradeoff you accept for consolidation.
Reflect Digital
Paid social across London and Kent, with LinkedIn as part of the mix. Suits companies wanting a regional relationship alongside London coverage.
ClickSlice
London agency with over a decade of experience across digital marketing including LinkedIn advertising. Long track record, broad service range.
Flow20
London LinkedIn ads for B2B brands, positioning around AI-led campaigns focused on qualified leads, cost per lead and pipeline growth.
Get-Found
London LinkedIn Ads offering across Sponsored Content, Lead Gen Forms and Message Ads, aimed at B2B lead generation.
Which Type Do You Need?
| If… | Choose |
|---|---|
| LinkedIn is your primary demand channel | Specialist |
| You spend £5,000+/month on LinkedIn alone | Specialist |
| You need outbound connected to ad engagement | Specialist |
| LinkedIn is one of four or five channels | Full-service |
| You want one agency, one invoice, one contact | Full-service |
| You need brand, web and paid together | Full-service |
| Spend is under £3,000/month total | Freelancer |
More detail in agency vs in-house vs freelancer.
Choosing for a London Audience
Three things worth asking any London agency, because they are specific to this market:
"How do you handle audience saturation?" A London-focused B2B audience is often only 10,000–25,000 people. Budget that would be sensible nationally drives frequency into double figures here. Ask about creative rotation cadence and how often they check frequency.
"How do you target London?" LinkedIn location comes from profile data, so people working in London often show an older location. Targeting London alone under-reaches. Good answers involve Greater London plus commuter belt, or company-based targeting from an account list.
"Should I even restrict to London?" Most B2B companies with national or European buyers restrict targeting to London purely because they are based there. A good agency will push back on this. It is the most common London targeting mistake we see.
The other ten questions to ask anyone are in how to choose a LinkedIn Ads agency.