Leeds Teaching Hospitals NHS Trust, Cardiff University - Centre for Trials Research, University of Leeds - Leeds Institute of Clinical Trials Research, University College London, National Radiotherapy Trials QA (RTTQA) Group, National Radiotherapy Trials QA (RTTQA) Group, Independent, University of Leeds - Leeds Institute of Clinical Trials Research, St James’s University Hospital, University of Leeds - Leeds Institute of Clinical Trials Research, University Hospitals Bristol - University Hospitals Bristol and Weston NHS Foundation Trust, Government of the United Kingdom, Department of Health, National Health Service (NHS), Mount Vernon Cancer Centre Northwood, King’s College London, University College London - Department of Medical Physics and Biomedical Engineering, University Hospitals Sussex NHS Foundation Trust, Government of the United Kingdom - Oxford University Hospitals NHS Foundation Trust, NHS Foundation Trust - Royal Marsden Hospital, The University of Manchester - Manchester Cancer Research Centre, University of Leeds - Institute of Medical Research, University of Leeds, University of Leeds - Leeds Institute of Clinical Trials Research, University of Surrey, University Hospitals Sussex NHS Foundation Trust, Leeds Teaching Hospitals NHS Trust, University of Leeds - Institute of Medical Research and Mount Vernon Hospital