Prince William and his fiancée Catherine Middleton narrowly escaped the indignity of having ‘WC’ inscribed on their wedding souvenirs.

Luckily, the designers noticed the gaffe and decided to switch the initials to CW, making Kate the first royal bride to have her initial above the groom's on the official ­commemorative china.

"When the collection was being designed they immediately noticed the problem,” a Palace insider told mirror.co.uk.

"If they followed tradition with the man's name first, as in the case of Charles and Diana, it would be an embarrassing royal flush."