Thanks to Pete for sending this circular postcard from Bletchley Park, near Milton Keynes.
The postcardshows the rea of a drum from the Bombe Machine which was developed to speed up the process of breaking Enigma messages during World War 2.
You can find out more about Bletchley Park here.
I loved watching the movie ‘The Imitation Game’ – Wonderful insight into how the intelligence hub cracked codes during WWII.