The London Clinic


  • Gastroenterology

Sub specialties

  • Colon cancer screening
  • Gastro-oesophageal reflux/Barrett's oesophagus
  • Irritable bowel syndrome

Professional profile

Dr Preston graduated from St Mary's Hospital Medical School, Paddington in 1995.
His PhD, undertaken at Cancer Research UK, London, outlined the role of stem cells in gastrointestinal cancers.
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The majority of his postgraduate training was centred at Barts and the London NHS Trust, in addition to a year spent in Sydney as an Advanced Endoscopy Fellow, prior to his appointment as a consultant at Barts and the London NHS Trust.
His clinical practice focuses on the diagnosis and treatment of gastro-oesophageal reflux disease, Barrett's oesophagus, inflammatory bowel disease (Crohn's disease and ulcerative colitis) and irritable bowel syndrome.
His endoscopic expertise relates to gastroscopy, colonoscopy and endoscopic ultrasound and he is an accredited colonoscopist for the National Bowel Cancer Screening Programme.
He has written numerous papers and book chapters on gastrointestinal cancer and continues his research in Barrett's oesophagus.
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Personal profile

Dr Preston enjoys tennis, golf and cycling.
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Current posts

  • Consultant Gastroenterologist/Director of Endoscopy
    Barts and the London NHS Trust
  • Honorary Lecturer
    Queen Mary, University of London
  • Nationally accredited endoscopy trainer

Medical training

Year qualified
  • St Mary's Hospital Medical School

Ages treated

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Clinic location

116 Harley Street
London W1G 7JL
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Clinic times

Tuesday: Evening
Friday: Afternoon


Victoria Hollings
020 7616 7645/2