A GB Royal Wedding first day cover signed by the photographer Mario Testino will be auctioned at theatre charity Chicken Shed's gala dinner on Sunday.

Testino, Princess Diana's favourite photographer, took the engagement photographs of Prince William and the then-Kate Middleton, which were used on the stamps.

Tickets for the £350 dinner on Sunday at the Savoy Theatre, London, are still available: www.chickenshed.org.uk/1208/shows/annual-gala-performance-at-the-savoy-theatre-hotel.html