This report is a key milestone in the evaluation of Your Choice, a London-based programme to tackle violence affecting young people. The report recommended progression to a full-scale Efficacy trial, indicating that the design of the programme’s evaluation known as the London Young People Study (LYPS) works, and that sufficient promise of the Your Choice programme has been shown during the Pilot trial to warrant further funding. The Efficacy trial, which began in August 2023, will run until December 2024 and is expected to involve around 1500 young people.