Cast of Imitation Game outfoxed by crossword

Hollywood star Keira Knightley has told how she and fellow actors who play a team of gifted code-crackers spent five days trying to solve a quick crossword.

The 29-year-old said she and a five-strong group of colleagues – including Benedict Cumberbatch – who portray encryption specialists in The Imitation Game were still unable to finish it even after all that time.