Johnny and the Bomb
by Terry Pratchett (Doubleday, 1996); audiobook read by Richard Mitchley (BBC Audiobooks, 1997)
Pratchett gifts middle-grade readers the perfect introduction to time travel, albeit that his mid-1990s ‘now’ is itself receding into history, in rapid pursuit of the Second World War ‘then’. Thought-provoking and wryly funny, with memorable characters and a rich vein of dialogue.