He is credited as the designer of the police telephone box, which has since become a pop culture icon owing to its immortalisation as the space-time machine of Doctor Who.
[4] Trench also designed Charles Rowan House on Margery Street, Clerkenwell, which was built in the 1920s as married quarters for Metropolitan policemen.
He was one of five children and the eldest of two sons to the Scottish civil engineer, Gilbert Kennedy Campbell Trench (1855–1937), and his wife Clementina née Flett (1857–1938).
By 1969, however, walkie-talkies and quick response vehicles such as the Ford Zephyr had made it redundant, and the home secretary James Callaghan had nearly all of them demolished.
[citation needed] Mackenzie Trench married Dorothy Olare Buswell Booth on 31 August 1912 at the Church of Emmanuel, East Dulwich.