It's traditional for the sender of Valentine cards to remain secret. Now Bletchley Park is helping add to the secrecy. It is issuing a special stamp and postmark for cards sent through its secret little post office.
Collectors are already snapping up the limited edition stamps at £40 for a sheet of 20. But visitors who bring their Valentine cards along to Bletchley Park before the 10th February can have the stamp and postmark added for just £1.50.
It is all part of the activity leading up to a Bletchley Park's first Valentine event on February 10th. As well an exhibition on Valentines through the Ages visitors will be able to make their own Valentines to be send through the secret post.