Muhunthan Thillai BA MRCP PhD is Lead Clinician, atCambridge Interstitial Lung Unit, Royal Papworth Hospital NHS Foundation Trust, Visiting Senior Research Fellow, University of Cambridge,UK. Peter Bailey MBBS is Specialty Registrar in Respiratory Medicine, at Royal Papworth Hospital NHS Foundation Trust, Evelyn Trust Fellow, Cambridge, UK. Keith Hattotuwa MBBS FRCP is Consultant Physician, Senior Lecturer in Respiratory Medicine, at Broomfield Hospital, Mid Essex NHS Foundation Trust, Chelmsford, UK.