Put your brain to the test with never-before-seen mind benders, riddles and puzzles inspired by the code breakers of Bletchley Park.

See if you have what it takes to join the country's elite code-breaking team, with a collection of never-before-seen tests, riddles and puzzles from Bletchley Park.

'McKay's book [The Secret Life of Bletchley Park] is an eloquent tribute to a quite remarkable group of men and women, whose like we will not see again.'