Born 19 May 1875 at 14 Seaton Terrace, Mutley, Plymouth, eldest child of Lewis Charles Thomson, accountant with the Admiralty, and Julia Boase, his wife. He was educated at Blackheath High School, and at Guy's Hospital, where he served as house surgeon and as obstetric registrar. He served also for a time as clinical assistant at the Evelina Hospital for Sick Children. Thomson's life was spent in general practice at Granville Park, Lewisham, and at Wimborne in Dorset, where he settled in 1906. He was a member of the firm of which Sir Kaye LeFleming, MD, MRCS 1898, was senior partner. He served as medical officer of health for the Wimborne and Cranborne Rural District; and was also police surgeon and certifying factory surgeon. He was a medical referee for the Prudential and Pearl Insurance Companies. Thomson married at Bexhill on 14 February 1912 Ethel Oliver. He was survived by his son, Lewis Charles Thomson, MRCS 1937, MB BS London, a member of the teaching staff at Guy's Hospital Medical School (1943), and by his twin daughters. He practised at Romansleigh, 30 West Street, Wimborne. He died at Wimborne on 29 June 1943 as the result of a road accident, and the funeral service was held at Wimborne Minster. Botany was his favourite recreation.