She became a member of the WRNS during World War II and was recruited to work in Bletchley Park at the age of 18.[6][7] She was four foot ten inches (1.47m) in height and required a special footstool to operate the top rotors."[12] Valentine volunteered as a tour guide at the Bletchley Park Museum, demonstrating the reconstructed Bombe.On 24 June 2012, Valentine spoke about her wartime experiences at Bletchley Park and elsewhere as part of a Turing's Worlds event to celebrate the centenary of the birth of Alan Turing, organised by the Department for Continuing Education's Rewley House at Oxford University in cooperation with the British Society for the History of Mathematics (BSHM).[18][19] Valentine is commemorated on the Bletchley Park Roll of Honour, which contains a digital copy of her service certificate and a short memoir.