Royal wedding Oyster card planned
The most unusual royal wedding souvenir yet is being planned for Prince William's marriage to Kate Middleton - a special edition Oyster card.
The popular plastic smartcard will have a makeover to mark the event and will go on sale before the pair tie the knot on April 29 next year at Westminster Abbey.
The souvenir Oyster card is likely to feature an image of the happy couple and will probably be snapped up by tourists and Londoners alike.
Transport for London commissioner Peter Hendy told London's Evening Standard newspaper: "One of the things we have not done with Oyster is what they have made a huge success of in Hong Kong - selling limited editions.
"Some of the limited editions of the Octopus card are worth a fortune. We will do one for the royal wedding and it will be extremely tasteful.
"It will be the first one we have put on general release."
Oyster cards - used to store cash for travel and season tickets - were launched in 2003 and now more than seven million of them are regularly used by commuters in the capital.
The marriage of William's parents, the Prince of Wales and Lady Diana Spencer, in 1981 was also marked by the transport authority of the day with a special ticket.
The prince's engagement to Miss Middleton has seen a range of items come on to the market to mark the occasion from royal photographer Robin Nunn's picture book William & Kate to a Royal Mint commemorative £5 Alderney coin.