Want to blow up your brand in London but don’t know which PR agency actually gets results with influencers? You’re not alone. Hundreds of brands - from vegan snack startups to luxury skincare lines - spend thousands on influencer campaigns every month, only to get zero sales or engagement. The problem isn’t the influencers. It’s the agencies they work with.
London’s influencer scene is massive. Over 1.2 million active creators live here, from TikTok food reviewers in Peckham to Instagram fashion stylists in Notting Hill. But not every PR agency understands how to match the right person with the right brand. Some still send generic pitches to 500 people. Others pay £500 to a micro-influencer who hasn’t posted in six months. That’s not marketing. That’s throwing money at a wall.
Here’s who actually delivers. These are the five PR agencies in London that consistently drive real sales, measurable engagement, and long-term brand loyalty through influencer partnerships - backed by client results, not just flashy websites.
1. The Influencer Agency
Founded in 2019 by former Vogue editors, The Influencer Agency doesn’t just book posts. They build campaigns around real behavior. For example, they helped a London-based organic tea brand increase sales by 217% in 90 days by working with 12 mum bloggers in South London who actually drink tea while commuting. These weren’t big names - their average follower count was 8,400. But their engagement rate? 9.3%. That’s five times the London average.
What sets them apart: They use proprietary software to track which influencers’ audiences actually buy products within 14 days of posting. They don’t care about likes. They care about checkout data. They also refuse to work with influencers who have bought followers. Their vetting process includes reverse-image searches and audit tools that detect fake engagement patterns.
They work with brands in food, beauty, and wellness. Minimum campaign spend: £15,000. Clients include Pukka Herbs and The Ethical Tea Partnership.
2. Spark Collective
Spark Collective specializes in Gen Z and Gen Alpha audiences - the groups that actually drive trends in London. Their biggest win? Getting a small East London candle brand, Wick & Co., into 17 university dorm rooms across the city in under 30 days. They didn’t pay for ads. They gave free candles to 40 student influencers who posted unboxing videos with their roommates. One video got 2.1 million views on TikTok.
They don’t use traditional media kits. Instead, they give influencers creative freedom: "Here’s your product. Here’s our brand values. Go wild." That approach led to a 32% increase in brand recall for their client, a plant-based protein brand called Plant Fuel.
They’re strict about authenticity. If an influencer’s last three posts were all sponsored, they won’t work with them. They look for people who post real life - messy kitchens, late-night study sessions, rainy walks in Hampstead Heath.
Minimum spend: £12,000. Ideal for startups targeting under-25s.
3. Lumen PR
Lumen PR is the go-to for luxury and high-end brands. They’ve worked with Harrods, Fortnum & Mason, and a dozen boutique hotels in Mayfair. But their secret sauce? They don’t work with influencers who only post about "luxury." They find people who live it.
For a new London-based champagne brand, they partnered with a food critic who runs a private supper club in Chelsea. He didn’t post about the champagne. He served it at a dinner with 12 guests - and filmed the reactions. The video went viral in wine circles. Sales jumped 40% in two weeks.
Lumen avoids influencers with over 100K followers. Why? Because smaller creators have tighter, more loyal communities. Their clients see 6-8% conversion rates from influencer traffic - far above the industry average of 2.1%.
Minimum spend: £25,000. Best for premium products with high margins.
4. Bloom & Co.
Bloom & Co. is the only agency in London that focuses exclusively on neurodiverse influencers. That includes creators with autism, ADHD, and dyslexia - a group often ignored by mainstream PR. But their audience? Highly engaged, loyal, and willing to spend.
They helped a London-based sensory-friendly clothing brand, Soft Threads, launch a campaign with 15 influencers who shared how textured fabrics improved their daily lives. One influencer, a 22-year-old with autism, posted a 7-minute video showing his morning routine in his new clothes. It got 890,000 views. Sales doubled in 10 days.
Bloom & Co. doesn’t just find influencers. They train them. They offer workshops on storytelling and camera confidence. They also pay influencers fairly - no "exposure" deals. Everyone gets paid upfront.
Minimum spend: £10,000. Perfect for brands in mental health, accessibility, or inclusive fashion.
5. City & Co.
If you want to be seen by London’s professionals - the 30-45 age group that shops on lunch breaks and books weekend getaways - City & Co. is your best bet. They work with LinkedIn creators, podcast hosts, and local journalists who have built trust over years.
They helped a new London-based coffee roastery, Grounds & Co., get featured in 17 corporate newsletters and 3 local business podcasts. One podcast episode reached 45,000 listeners. The brand sold out of its first 500 bags in 11 days.
They don’t chase viral trends. They chase credibility. Their influencers are often writers, chefs, or small business owners who’ve been in London for over a decade. Their audience trusts them because they’ve seen them at farmers’ markets, book clubs, and gallery openings.
Minimum spend: £18,000. Ideal for B2B, premium food, and lifestyle brands targeting professionals.
How to Pick the Right One for Your Brand
Not every agency is right for every brand. Here’s how to choose:
- Are you targeting Gen Z? Go with Spark Collective.
- Do you sell luxury or high-ticket items? Lumen PR is your match.
- Is your product inclusive or accessibility-focused? Bloom & Co. has the audience and the ethics.
- Are you a food, drink, or wellness brand with local roots? The Influencer Agency knows who’s actually buying.
- Are you selling to professionals or business owners? City & Co. gets you into the right circles.
Ask any agency this question: "Can you show me real sales data from your last three campaigns?" If they only show you screenshots of likes or follower counts - walk away. Real results come from conversion tracking, promo codes, and UTM links.
Red Flags to Watch Out For
Here’s what to avoid:
- Agencies that promise "100K impressions" without mentioning engagement or sales.
- Those who won’t share influencer lists before you pay.
- Any agency that uses the same template for every brand.
- Teams that don’t have a London-based team - remote agencies miss local culture.
- Those who say "We work with everyone from micro to mega influencers" - that’s a sign they don’t specialize.
London’s influencer market is saturated. But the ones who win? The ones who pick partners who understand real people, not just numbers.
What Happens After the Campaign?
A good agency doesn’t disappear after the posts go live. They follow up. They track which influencers’ audiences come back to your site. They ask for feedback from the creators. They send you a report with screenshots of comments, links to reposts, and even screenshots of customers tagging your brand in stories.
One client of The Influencer Agency got a DM from a mum who said: "I bought your tea because I saw @londonmumofthree post it. I’ve been drinking it every morning for three weeks now." That’s the kind of result you want.
Don’t treat influencer marketing like a one-off ad. Treat it like a relationship. The best agencies in London know that.
How much does influencer marketing cost in London?
Costs vary widely. Micro-influencers (5K-50K followers) typically charge £200-£800 per post. Mid-tier (50K-200K) charge £1,000-£5,000. Macro-influencers (200K+) can charge £10,000+. But the best agencies don’t just pay for posts - they build campaigns. Most effective campaigns start at £10,000-£25,000, depending on reach, duration, and goals. The key is ROI: track sales, not likes.
Do I need to work with an agency, or can I do this myself?
You can do it yourself if you have time and connections. But most brands underestimate how hard it is to find the right people, negotiate fair deals, track results, and avoid fake influencers. Agencies save you 80+ hours of research and reduce your risk of wasting money. For most small to mid-sized brands, the ROI from hiring a specialist agency is 3-5x higher than going solo.
What’s the difference between influencer marketing and traditional PR?
Traditional PR gets you coverage in newspapers or TV. Influencer marketing gets you trusted voices talking to their followers - often in casual, real-life settings. Influencers build emotional trust. Traditional media builds credibility. The best campaigns use both. But influencer marketing is faster, cheaper, and more measurable - especially for direct sales.
How do I know if an influencer is fake?
Check their engagement rate: if they have 50K followers but only 200 likes per post, they’re likely fake. Look for comments that sound robotic or generic. Use tools like HypeAuditor or IG Audit to scan for bought followers. Ask for their last 5 posts - if they’re all branded, they’re probably not authentic. Real influencers post about their lives, not just your product.
Which social media platform works best for London influencer campaigns?
It depends on your audience. TikTok rules for Gen Z and food brands. Instagram still dominates for fashion and beauty. LinkedIn is key for professionals and B2B. YouTube works for deep dives - like cooking tutorials or product reviews. Most successful campaigns in London use 2-3 platforms together. Don’t put all your money on one.
Next Steps
Start by listing your top 3 goals: Is it brand awareness? Sales? New customers? Then pick one agency from the list above that matches your audience. Don’t contact all five. Pick one. Send them your product, your target customer, and your budget. Ask for a case study from a brand like yours.
And remember: the best influencer campaigns don’t feel like ads. They feel like recommendations from a friend who knows what you like. Find an agency that understands that - and you’ll see real growth, not just likes.