Participants in the intervention arm will receive training in using the eRAPID system to report their symptoms and side effects (at least on a weekly basis) from home via the internet whilst they are receiving treatment online and weekly for 6 weeks post treatment (a total of 12 weeks) and then at 18 & 24 weeks. Hospital staff will be able to review eRAPID reports and use the information during the consultation in clinic, when attending RT or answering phone calls. Alerts will also be sent to the relevant clinical team when severe symptoms are reported by patients. All patients will complete a paper-based quality of life questionnaire at baseline and then 6, 12 and 24 weeks after.