Skip to main content

Welcome to the Circle Health Group website. We've changed our name from BMI Healthcare.

Mr Gregory Thomas

Consultant General and Colorectal Surgeon

MBBS, BSc, MD, FRCS (Gen Surg)

Practices at: The Clementine Churchill Hospital

A photo of Mr Gregory Thomas

Personal Profile

Personal Profile

Mr Gregory Thomas is a consultant colorectal surgeon working at St Mark's Hospital in London.

He qualified from Imperial College School of Medicine (St Mary’s Hospital) in 2003 with distinction in surgery and an intercalated BSc from Imperial College, London. His basic surgery training was undertaken at St Mary’s Hospital and in the northwest London region.

Mr Thomas received specialist general and colorectal training in southwest London and Surrey. He undertook two years of research into pelvic floor disorders at St Mark’s Hospital (a world renowned hospital for bowel disorders) and was awarded a post graduate research degree (MD) from Imperial College, London.

He has maintained a strong ongoing research interest in this field. He has published nearly 40 peer reviewed papers and four text book chapters on pelvic floor and colorectal disorders. He has presented widely on these subjects at national and international meetings.

He was awarded a travelling fellowship from the Association of Coloproctology of Great Britain and Ireland in 2016, and has spent time at the world renowned Cleveland Clinic Hospitals in Florida and Ohio, and at the Centre Hospitalier Universitaire de Nantes, France. He received the FRCS from the Royal College of Surgeons of England in 2016.

Prior to his appointment to Ashford and St Peter’s, Mr Thomas spent a further year at St Mark’s Hospital as a Resident Surgical Officer for higher post graduate training. He was previously a consultant colorectal surgeon at Ashford and St Peter's NHS Trust.

Clinical Interests

Clinical Interests

  • Colonoscopy
  • Colon cancer
  • Laparoscopic surgery
  • Abdominal wall hernia
  • Groin hernia
  • Rectal prolapse
  • Constipation
  • Faecal incontinence
  • Haemorrhoids
  • Anal fistula
  • Anal fissure
  • Skin lesions

Professional Memberships

Professional Memberships

  • Fellow of the Royal College of Surgeons of England
  • The Association of Coloproctology of Great Britain and Ireland
  • The Pelvic Floor Society
  • The European Society of Coloproctology
  • The European Society of Neurogastroenterology and Motility
  • Medical Protection Society

Current NHS and /or University Posts

  • St Mark's Hospital