The London Youth Involvement Project aimed to bring together a group of young people from across London to ensure youth voices were included in debates around drug and alcohol prevention. Over three years, 20 Youth Advisors were recruited and trained to identify issues, research prevention topics, and deliver recommendations based on their findings. Ensuring the Youth Advisors led the project and that their ideas informed its direction was a key goal to avoid tokenism. Through activities like research and conferences, the Youth Advisors gained skills while helping to shape prevention policy and practice in London.