# David 2 Goliath > Paid-ads and lead-generation agency exclusively for UK estate and letting agents. We book qualified valuation and landlord appointments straight into the agent's diary through the D2G Performance Engine: paid media, AI qualification, calendar booking and full reporting. For qualifying clients the return is guaranteed at 3X. David was never the underdog. He was simply underestimated. Key facts: - Audience: UK estate and letting agents only (independent agencies, and networks or franchise groups) - Product: qualified valuation and landlord appointments booked into the diary, not raw leads - Proof: Orlando Reid, London, May 2025. 477% ROI in twelve days, first instruction in 11 days, £45.02 cost per qualified lead, 50% of qualified appointments closed - Guarantee: 3X return on investment for qualifying clients - Founder: Gareth Melly, two decades building campaigns for global brands including Dyson, Rolex, Pepsi, Samsung, Virgin and EY ## Main pages - [Home](https://www.david2goliath.com/): What the D2G Performance Engine does and who it is for - [For independent agencies](https://www.david2goliath.com/independents): Qualified appointments owned by the agency, not rented from portals - [How it works](https://www.david2goliath.com/how-it-works): The four parts of the engine in detail - [Orlando Reid case study](https://www.david2goliath.com/results/orlando-reid): The full 477% ROI campaign, day by day - [About](https://www.david2goliath.com/about): Who is behind David 2 Goliath and how we work - [Book a growth call](https://www.david2goliath.com/book): Thirty minutes, straight answers, no pitch theatre ## Insights - [Insights index](https://www.david2goliath.com/insights): Articles for UK estate and letting agents on lead generation, AI qualification and marketing attribution