Devinder Singh Bansi is a leading London gastroenterologist and interventional endoscopist offering expert diagnosis and treatment for conditions such as diarrhoea, dyspepsia, coeliac disease, bowel cancer, ulcerative colitis, peptic ulcer disease, liver disease, Barrett's oesophagus and gallstones. He is based at 1 Welbeck Street, Marylebone, London, W1G 0AR.