Part of a tabard that may have belonged to him was discovered.

The Prince of Wales has been an undercover Big Issue seller on previous occasions, putting on the red tabard and baseball cap, and surprising tourists near Victoria in central London.

He has also donned the red tabard worn by Big Issue vendors to sell the magazines in the capital.

Workers in brightly coloured tabards lead them past defunct baggage carousels to the old departure halls which are now filled with crowded trestle tables.

The image of England's patron saint is the most substantial remaining wall painting in the castle and shows the figure of a kneeling knight wearing a tabard with the Hungerford arms alongside.