The design of the Bank of England’s new £50 note, featuring the computer pioneer and codebreaker Alan Turing, has been revealed.

The banknote will enter circulation on 23 June, which would have been the mathematician’s birthday.

It will be the last of the Bank’s collection to switch from paper to polymer. In keeping with Alan Turing’s work, the set is its most secure yet.

Old paper £50 notes will still be accepted in shops for some time.

Why is Alan Turing on the note?

The work of Alan Turing, who was educated in Sherborne, Dorset, helped accelerate Allied efforts to read German Naval messages enciphered with the Enigma machine. His work is said to have been key to shortening World War Two and saving lives.

Less celebrated is the pivotal role he played in the development of early computers, first at the National Physical Laboratory and later at the University of Manchester.