Welcome to the FRANK friends study website. The FRANK friends study is a Randomised Control Trial (RCT) evaluating the FRANK friends intervention, a school-based peer-led drug prevention programme. The study is taking place in South Wales and the West of England and involves both Cardiff University and the University of Bristol. Other partners include the University of York, the University of Glasgow, the London School of Hygiene and Tropical Medicine, Public Health Wales, the West of England Clinical Research Network, and South Gloucester and Bristol and North East Somerset council. FRANK friends is funded by the National Institute for Health Research (NIHR) Public Health Research Programme.