- Attendance at out-patients clinics at Bristol Royal Hospital for Children, Southmead Hospital in Bristol, Weston General Hospital, The Royal United Hospital in Bath, Gloucestershire Royal Hospital in Gloucester or the Musgrove Park branch of the Taunton and Somerset Hospital Aged 11-16 years old (inclusive) on the first day of the study Type 1 diabetes Duration at least 12 months on the first day of the study