A slice of royal wedding cake is going up for auction tomorrow.

The 68-year-old piece of cake from the marriage ceremony of the Queen and the Duke of Edinburgh is expected to fetch up to £500 at Gorringes in Lewes.

The fruit slice, about the size of a cigarette packet and laced with alcohol, was one of 2,000 dished out to guests at a lavish wedding reception at Buckingham Palace on November 20, 1947.

Despite this, wrapped in its original parchment, it is still edible.

It comes with a white cardboard presentation box, a miniature doily and an inscribed card sending "best wishes" from the happy couple.

Philip Taylor, from the auction house, said: "The cake is in a remarkable state considering it is 68 years old.

"It has been very well preserved due to all the rum and brandy in it.

"You could eat it but I wouldn’t recommend it."