'Wild' would be a generous way to describe the use of historical detail in The Imitation Game, the movie about Alan Turing. 'Based on', 'sourced from', so they say, but what in The Imitation Game isn’t invention? And why? Anyone who's read Andrew Hodges’s biography of the mathematician, or Mavis Batey’s book about Dillwyn Knox, with whom Turing worked at Bletchley from 1939 until Knox's death in 1943, will ask themselves why the movie made up so much when the tales of Turing and his colleagues are unbeatable stuff.

