The Imitation Game movie filming at Kings Cross London

Benedict Cumberbatch, seen on the front cover of Time Magazine* this October 2013, plays Alan Turing in The Imitation Game.

October 28, 2013 cover of Time magazine*

Playing Turing's one time fiance Joan Clark, mathematician, linguist/cryptanalyst and a co-worker at Bletchley Park is Pirates of the Caribbean and Atonement actress Keira Knightley. Filming this week has been at Kings Cross station in London.

From the Radio Times:

 - and The Express:

According to Martin Davis's (author of 'The Universal Computer: The Road from Leibniz to Turing') foreword, in the centenary edition of Sara Turing (Alan Turing's mother) book^ Alan M. Turing:

 "Although Alan let her [Joan Clarke] know from the beginning of his homosexual "tendencies", she remained willing to continue the engagement. It was after they spent a week together on a bicycling trip in Wales, that he decided that it wouldn't work, and broke off the engagement. They were, and remained, very fond of one another..." (2012, Cambridge University Press, p. xiii). 

 - book^ available from Amazon :