Jack Slipper Jack Slipper Jack Kenneth Slipper (20 April 1924 in London – 24 August 2005 in Pershore) was a Detective Chief Superintendent in the Metropolitan Police in London. He was known as "Slipper of the Yard" (referring to Scotland Yard). He was mainly known for his role in investigating the Great Train Robbery of 1963, and in tracking down Ronnie Biggs after he escaped from prison in 1965, although he had to leave Brazil without Biggs. Slipper was born in Ealing, west London, and educated at Little Ealing School. He left school aged 14 and worked as an electrician's apprentice until
Jack Mills of the train robber who assaulted Mills is the subject of some debate, but most sources agree that Mills' assailant was one of three members of the gang who was never identified. He was referred to as "Mr Three" by Ronnie Biggs, and "Alf Thomas" by Piers Paul Read and Bruce Reynolds. Where all accounts agree, is that Gordon Goody made Mills drive the train after the failure of the robbers' substitute driver, and that Charlie Wilson told Mills not to worry and that he would not be harmed and ensured he was left alone after that. Williams (at the