S J Fenning1, D E Newby2, C Toumpanakis3, M W J Strachan4. 1. From the Royal Infirmary of Edinburgh, Edinburgh Heart Centre, Edinburgh sj.fenning@btinternet.com. 2. From the Royal Infirmary of Edinburgh, Edinburgh Heart Centre, Edinburgh. 3. Royal Free Hospital, Neuroendocrine Tumour Unit, London. 4. Western General Hospital, Metabolic Unit, Edinburgh, UK.