1. Department of Paediatric Oncology Southampton Children's Hospital Southampton UK
2. Cancer Sciences Unit University of Southampton Southampton UK
3. Department of Paediatric Oncology Great Ormond Street Hospital London UK
4. Department of Haematology The Newcastle upon Tyne Hospitals NHS Foundation Trust Newcastle UK
5. Children's Brain Tumour Research Centre, Bio‐Discovery Institute and Queen's Medical Centre University Hospital Nottingham Nottingham UK
6. Department of Paediatric Oncology Alder Hey Children's Hospital Liverpool UK
7. Department of Paediatric Oncology University Hospitals Bristol and Weston NHS Foundation Trust Bristol UK
8. Department of Paediatric Haematology Great Ormond Street Hospital London UK