S W Dubrey1, G Rosser2, K Patel3, S J Whittaker4. 1. Consultant Cardiologist. 2. Cardiology Specialist Registrar in the Department of Cardiology. 3. Consultant Haematologist in the Department of Haematology, Hillingdon Hospital, Middlesex. 4. Consultant Dermatologist, St John's Institute of Dermatology, St Thomas Hospital, London.