Best Lead Generation Agencies in the United Kingdom (2026) – Ranked by Case Studies
Write Arm Client-verified
Lead Generation, Email Marketing
Marketing
11-50 Employees
N/A
Brighton, United Kingdom
N/A- 1,500+ leads generated through Sopro campaigns
- Cost per lead of £42 with a 4.3% lead rate
Wooshii Client-verified
Lead Generation, Email MarketingMedia & Broadcasting51-200 EmployeesN/ALondon, United KingdomN/A- 1,813 high-quality leads generated
- £200,000+ in revenue and 70% ROI, outperforming all other channels
OnIT Client-verified
Lead Generation, Email MarketingMSP1-10 EmployeesN/AHeckmondwike, United KingdomN/A- 4.2% lead rate at around £65 cost per lead
- First customer signed in six weeks
EnviroVent Client-verified
PPC, Lead GenerationManufacturing201-500 EmployeesN/AHarrogate, United KingdomN/A- 185% lead volume increase across 42 franchisees
- 25% YoY CPA cut
- 141% YoY growth
JLA Client-verified
PPC, Lead GenerationIndustrial501-1K EmployeesN/ARipponden, United KingdomN/A- 85% lead volume increase
- 178% YoY revenue increase
PPC, Lead GenerationMSP51-200 EmployeesN/AMilton Keynes, United KingdomN/A- 1300% lead volume increase
- 50% reduced CPA
- CPA 12% below target
Droylsden Glass Client-verified
Social Media Ads, SEO, Lead GenerationManufacturingN/AN/AAudenshaw, United KingdomN/A- Instagram followers up 593%
- Verified contact forms up 396%
- Organic website sessions up 234%
Newton Waterproofing Client-verified
PPC, SEO, Lead GenerationConstructionN/AN/ATonbridge, United KingdomN/A- Vetted website leads up 54% in 12 months
- Google Ads cost per conversion down 15%
SEO, PPC, Lead GenerationManufacturingN/AN/ALisburn, United KingdomN/A- Lead generation up 2,285% over 8 years
- Average of 220 leads per month
Woodstock Campers Client-verified
Social Media Ads, Lead Generation, Content MarketingAutomotiveN/AN/AFenny Compton, United KingdomN/A- 2,215 Meta Ads leads at £12.50 each (Aug 2025-Aug 2026)
Social Media Ads, Lead GenerationAutomotiveN/AN/AWeston-super-Mare, United KingdomN/A- 367 leads at £4.18 each in two months
- Leads on a £46,500+ product
Content Marketing, Lead GenerationFitnessN/AN/AHigh Wycombe, United KingdomN/A- 2,000+ new local followers in twelve months from Reels
Glasswall Client-verified
Content Marketing, Lead GenerationCyber Security51-200 EmployeesN/ALondon, United KingdomN/A- 124+ pieces of coverage
- 48+ national and broadcast media interviews, leading to 30 pieces of coverage
- Marketing assets downloaded 70 times
Content Marketing, Lead GenerationTechnology201-500 EmployeesN/AMaidenhead, United KingdomN/A- 120+ pieces of unique editorial coverage
- 50+ marketing campaigns delivered
- 16% increase in Twitter engagement, 35% on LinkedIn
- 1,200+ new organic followers and 7,800+ web sessions from social
Content Marketing, Lead GenerationTechnologyN/AN/ABasingstoke, United KingdomN/A- £12M+ in leads converted to qualified opportunities
- £6M in further attributed lead generation
- 200 pieces of coverage in 12 months
- Research reports downloaded 414 times, 50 active sales leads
Carbon Clean Client-verified
Branding, SEO, Lead GenerationEnvironmental Services51-200 EmployeesN/ALondon, United KingdomN/A- $113M+ pipeline value created in the first year from online sources
- +400% organic traffic over 6 months
- +162% lead generation YoY
- Millions added to pipeline within 60 days
Lead GenerationMedia & Broadcasting1K-5K EmployeesN/ALondon, United KingdomN/A- 124+ new publishers recruited in three months
- 78% publisher activation rate
- 7.2x ROI
- 492,648 clicks generated
- 68% share of affiliate conversions delivered by AP
Lead GenerationCyclingN/AN/ALondon, United KingdomN/A- +85% revenue QoQ
- -41% average cost of sale
- +64% new customer sales QoQ
Lead GenerationCyclingN/AN/ALondon, United KingdomN/A- +282% affiliate revenue share over six years (5.8% to 22%)
- +31% global, +146% US and +16% UK revenue YoY
- +67% US and +51% UK new customer acquisition YoY
Content Marketing, Lead GenerationTechnology51-200 EmployeesN/ABristol, United KingdomN/A- 20 media placements
- 1.4 billion reach
- 2 award wins
- 4 inbound leads
Content Marketing, Lead GenerationManufacturing501-1K EmployeesN/ACheltenham, United KingdomN/A- 12,000+ TikTok views
- 30,000+ industry professionals reached
- 175 installers signed up to the loyalty platform
- 4 channels with increased impressions and engagement
Lead GenerationConsultingN/AN/ALondon, United KingdomN/A- 20,000 UK founders added as LinkedIn connections in 12 months
- About 50 connection accepts per day, about 10 responses
- Up to 5 sales meetings per day
Lead GenerationSaaSN/AN/ALondon, United KingdomN/A- LinkedIn connections grew from 1,000 to 6,000+
- 5-10 solid contacts per month from responses
Lead GenerationSaaS1-10 EmployeesN/ALondon, United KingdomN/A- 1 new subscription per day after the first month
PPC, Lead GenerationManufacturing11-50 EmployeesN/ALondon, United KingdomN/A- -67% cost per lead (£89 to £29)
- £49K revenue generated in the first two months
- 70 leads delivered in seven weeks
- 16x return on investment on under £3K ad spend
PPC, Social Media Ads, Lead GenerationRetailN/AN/ASheffield, United KingdomN/A- +340% monthly leads in a single quarter
- -62% cost per lead
- -58% Meta prospecting CPL (£122 to £51)
- +487% Meta prospecting volume (15 to 88 leads a month)
Lead GenerationCyber Security1K-5K EmployeesN/ACambridge, United KingdomN/A- 216 sales professionals placed over three years
- Became exclusive hiring partner after one year
- 16-day average time-to-hire
- 14 memoryBlue alumni hired
Lead GenerationCyber SecurityN/AN/ALondon, United KingdomN/A- $190K monthly revenue run-rate
- 14 active resellers recruited in 18 months
- Major distributor signed within 6 weeks
- First deal closed within 90 days
Lead GenerationCleaning201-500 EmployeesN/AAshby-de-la-Zouch, United KingdomN/A- 120% increase in leads using the HubSpot stack
- Pardot, DotDigital and three Salesforce orgs consolidated into one portal
Lead Generation, CROCleaning201-500 EmployeesN/AAshby-de-la-Zouch, United KingdomN/A- 60% more chatbot conversations started in the first month
- 200% increase in chatbot-generated leads, June versus May 2023
- 20% rise in average chatbot enquiries versus pre-implementation
PPC, Lead GenerationSaaS501-1K EmployeesN/ABrighton, United KingdomN/A- +22% increase in ROAS
- -53% decrease in cost per SQL
- -18% decrease in cost per meeting booked
PPC, Lead GenerationSaaS51-200 EmployeesN/ALondon, United KingdomN/A- 229% increase in lead volume in three months
- 90% improvement in lead-to-customer conversion cost
- 73.3% rise in conversion rate
- 52.9% YoY drop in CPA
PPC, Lead GenerationFinance11-50 EmployeesN/ACheadle, United KingdomN/A- Ad spend down 9% while conversion value rose 38%
- Cost per lead down 29%
- Call-centre leads 2.5x more likely to convert
- Profits up 750%
SEO, Web Design, Lead GenerationEnergyN/AN/ABillingham, United KingdomN/A- 619 qualified leads generated in year one
- 150% organic lead target exceeded in year two
- 90% increase in organic traffic YoY
SEO, Lead GenerationSaaS51-200 EmployeesN/ALondon, United KingdomN/A- 5x return on investment
- 420% increase in leads
Branding, Lead GenerationHeavy Equipment10K+ EmployeesN/ARocester, United KingdomN/A- 2,968 Qualified Leads In Less Than Three Months
Find the best Lead Generation agencies in your industry
Find the best Lead Generation agencies in your country
- Canada
- United Kingdom
- United States
Find the best Lead Generation agencies in your state or region
Find the best Lead Generation agencies in your city
Find the best Lead Generation agencies for your business size