[2][3][4][5] He was born in Boston, Lincolnshire, the son of William Gilliatt, and received his medical training at the Middlesex Hospital.
He was also elected to the staff of King's College Hospital in 1916, retiring as senior gynaecologist in 1946.
[5] During the First World War he was commanding officer of the medical subsection of the hospitals at King's and St Thomas'.
[2] He was gynaecologist to the Royal Household for more than 20 years and attended Queen Elizabeth II at the births of Prince Charles and Princess Anne.
He had married anaesthetist Dr Anne Louise Kann, daughter of John Kann of Lyne, Surrey, by whom he had a son, Roger, now on the staff of the National Hospital for Neurology and Neurosurgery in Queen Square, London and a daughter, Elizabeth, a former secretary to Sir Winston Churchill.