Britons of Distinction, Triple Signed

2012 Britons of Distinction, Buckingham Tribute to Alan Turing cover with Bletchley Park, Milton Keynes special postmark, signed by actor Peter Firth and Baroness Jean Trumpington (1922 - 2018) and Sir Arthur Bonsall (1917 - 2014) who both worked at Bletchley Park during World War II.