1. Birmingham Regional Severe Asthma Service, Heartlands Hospital University Hospitals Birmingham and University of Birmingham Birmingham UK
2. Department of Respiratory Medicine Nottingham University Hospitals NHS Trust Nottingham UK
3. Portsmouth Hospitals University NHS Trust Portsmouth UK
4. Liverpool University Hospitals NHS Foundation Trust and University of Liverpool Liverpool UK
5. Gartnavel General Hospital Glasgow and University of Glasgow Glasgow UK
6. North Bristol Complex Airways Service, Southmead Hospital, North Bristol NHS Trust & Academic Respiratory Unit, Translational Health Sciences, Bristol Medical School University of Britsol Britsol UK
7. Severe Asthma Service, Wythenshawe Hospital Manchester University NHS Foundation Trust Manchester UK
8. Cambridge University Hospitals NHS Foundation Trust Cambridge UK
9. Guy's Severe Asthma Centre, Guy's & St Thomas' NHS Trust London UK
10. School of Immunology & Microbial Sciences King's College London London UK
11. Royal Brompton and Harefield Hospitals London UK
12. Derriford Hospital University Hospitals Plymouth NHS Trust Plymouth UK
13. Oxford Respiratory NIHR BRC, Nuffield Department of Medicine, Infection and Inflammation University of Oxford Oxford UK
14. Department of Respiratory Medicine Barts Health NHS Trust London UK
15. Barts and the London School of Medicine and Dentistry Queen Mary University of London London UK
16. Department of Respiratory Medicine, College of Life Sciences University of Leicester Leicester UK
17. Leicester NIHR Biomedical Research Centre (Respiratory Theme) Glenfield Hospital Leicester UK
18. Centre for Public Health, School of Medicine, Dentistry and Biomedical Sciences Queens University Belfast Belfast UK
19. Wellcome‐Wolfson Centre for Experimental Medicine, School of Medicine, Dentistry and Biomedical Sciences Queen's University Belfast Belfast UK