The Nasal Diamorphine Trial Group included the authors and the following staff at the participating hospitals (in alphabetical order): Revd Mr N Rawlinson and sister D Lee (Bristol Royal Infirmary), Dr L Goldsworthy and sister R Hoskins (Bristol Royal Hospital for Sick Children), Dr T Llewellyn and sister M Gilbert (Cheltenham General Hospital), Mr C Oakland and sister J Anderson (Frenchay Hospital, Bristol), Dr A Harris and sister H Anderson (Royal Devon and Exeter Hospital), Miss G Bryce and staff nurse S Tucker (Musgrove Park Hospital, Taunton), Dr S Meek and sister A Rumble (Royal United Hospital, Bath), and Dr R Evans and staff nurse A Skippins (University Hospital of Wales, Cardiff).