S Gwynne1, D Gilson2, J Dickson3, S McAleer4, G Radhakrishna2. 1. South West Wales Cancer Centre, Swansea, UK; National RTTQA Group, Cardiff, UK. Electronic address: sarah.gwynne@wales.nhs.uk. 2. St James Institute of Oncology, Leeds, UK. 3. Mount Vernon Cancer Centre, Northwood, UK. 4. Queen's University, Belfast, UK.