Dr Sean Preston

Consultant Gastroenterologist


A leading gastroenterologist, specialising in gastrointestinal cancer and Barrett's oesophagus. 

Dr Sean Preston is Consultant Gastroenterologist, based at the Royal London Hospital, Barts Health.

Dr Preston is Director of Endoscopy at Barts and the London NHS Trust and The Princess Grace Hospital. He is also an accredited colonoscopist for the National Bowel Cancer Screening Programme and is Deputy Screening Director for North East Thames. He has written numerous papers and book chapters on gastrointestinal cancer, and continues his research into Barrett’s oesophagus. 

Dr Preston’s clinical practice focuses on the diagnosis and treatment of gastro-oesophageal reflux disease, cancers of the gastrointestinal tract, inflammatory bowel disease and irritable bowel syndrome. His endoscopic expertise relates to gastroscopy, colonoscopy and endoscopic ultrasound.

Professional background


Dr Preston graduated from St Mary’s Hospital Medical School, Paddington in 1995. He undertook his PhD at Cancer Research UK, London.

The majority of Dr Preston’s postgraduate training was centred at Barts and the London NHS Trust, in addition to a year spent in Sydney as an Advanced Endoscopy Fellow. In 2013 he was featured in the Tatler Doctor Guide of Britain's top consultants. He becomes the President of the Gastroenterology Section of the Royal Society of Medicine in October 2015.

Services provided to HCA


Dr Preston provides medical advisory services for HCA's Princess Grace Hospital. In his role, Dr Preston leads interactions with hospital medical staff and the hospital leadership team to assist the hospital by providing medical advice and promote high quality, cost effective care.

In his role, he contributes to the strategy, policies and decision making regarding the Department of Endoscopy and advises HCA to ensure that care provided within the facility is appropriate and efficient. In his role, Dr Preston advises on initiatives to drive clinical standards by providing professional advice on clinical governance matters and ensuring the adoption of those by colleagues in Endoscopy.

In addition, he works with medical insurance companies, GPs, other relevant local NHS contacts, and patients to educate and advise on relevant clinical updates to treatments in Endoscopy available in the facility. Furthermore, he advises on the accuracy of literature that may be published regarding relevant services. He will also advise on how to make the patient referral smooth to reduce stress and anxiety for patients.

For example, recent work has included representing HCA in Arab Health, Dubai, showcasing the multidisciplinary team working with cutting edge technology. He has also been central in the redesign of the Endoscopy Unit, in addition to maintaining the Governance structure and represented the Unit at the Medical Advisory Committee. Together with Professor Silk he chairs the Gastroenterology and Hepatology Department meetings.

HCA UK is charged by doctors in return for their expertise and advice, including on how to operate safe hospital facilities delivering complex care. All services provided under this agreement are charged to HCA UK. From January to December 2017, the total charge was £26,082.00.

HCA requires the doctors that advise us to attest that if they also practice in the NHS that they are not compromising their NHS commitments.

The information disclosed on this page in accordance with the Private Healthcare Market Investigation Order 2014 is true and accurate to the best of HCA’s knowledge and belief.