 Patients will be seen every 3 weeks during treatment and every 3-6 months thereafter. CT scans will be done every 3 months during treatment and as per usual care usually 6 monthly after the treatment has finished. Patients in Group A will also have a cystoscopy camera test to look into the bladder 3 months after they finish radiotherapy. This is standard care and would be the same for patients not on a research study. 