One in ten people living with HIV in London remain undiagnosed and more than a third of new HIV diagnoses are late, causing damage to their health and increasing the risk of onward HIV transmission. Lambeth Council leads HIV prevention work across London, increasing early testing and diagnosis as part of their award-winning ‘Do It London’ campaign. This year, the council has set up the world’s first social impact bond to improve HIV diagnosis and treatment which will invest £2m in services across Lambeth, Southwark and Lewisham.