My specialist areas of particular interest include irritable bowl syndrome (IBS), constipation, colitis, crohn's, indigestion and swallowing disorders. I have over 20 years experience in conducting therapeutic colonoscopy, endoscopy and inpatient gastroenterology. I have extensive clinical experience in general medicine as well as gastroenterology and continue an active research programme which is important to stay at the leading edge of developments.

During the last 25 years, I have performed over 10,000 colonoscopies, over 20,000 gastroscopies, have undertaken between 4 and 5 gastroenterology outpatient clinics per week and have nearly 20 years experience with oesophageal physiology studies.

I was a Consultant Gastroenterologist at Addenbrooke’s, University of Cambridge Teaching Hospital (now retired). I was appointed to this position in 1995 and was the senior gastroenterologist in a unit of eight consultants. Over this period in Cambridge I established and developed an irritable bowl syndrome (IBS) service, upper GI cancer service, therapeutic gastroscopy service, oesophageal physiology service, and been the medical advisor for the local Crohn's and Colitis Association. I have also been the lead physician for the intestinal transplant service for 20 years, which has kept me up to date with the most difficult gastroenterological conditions.

I am the clinical lead of the gastroenterology physiology unit which I founded in 1997 and now provide a regional service for oesophageal manometry and ambulatory pH studies to investigate swallowing problems and indigestion.

I am the clinical lead of the Cambridge service for irritable bowel syndrome. The service uses dietary treatment as the primary mode of treatment. An audit of a 1,000 patients and the dietary treatment was found to be successful in over 70%. I have recently described a new syndrome of rapid gastric emptying and reactive hypoglycaemia (low blood sugars) and have introduced a new test (The SMART PILL) which is swallowed and wirelessly transmits pressure, temperature and pH from the entire GI tract representing a quantum leap forward in technology. I am currently working on a new test to identify food intolerance in irritable bowl syndrome (IBS) and the importance of micro flora of the colon. This could lead to new pro-bitoic and pre-biotic therapies.

I am also an associate clinical lecturer and senior research fellow at Cambridge University and Honorary Professor of Gastroenterology at Plymouth University Peninsular School of Medicine.