Prince Charles and Lady Diana tied the knot on July 29 1981. The royal couple   split in 1992, 11 years after their wedding.

Princess Diana died in a road crash in Paris in 1997, a year after they divorced.

Four decades their marriage, a slice of their wedding cake is up for sale.The cake is likely to fetch between £300 and £500 when it goes under the hammer along with an order of service, ceremonial details and a royal wedding breakfast programme, the Independent reported,

According to the Independent, "The large slice of cake icing and marzipan base from one of the 23 official wedding cakes features a sugared onlay of the Royal coat-of-arms coloured in gold, red, blue, and silver."

It said the cake was given to a member of the Queen Mother’s household who preserved the topping with cling film.

The report said, "She kept it in an old floral cake tin and taped a handmade label to the lid, reading: “Handle with Care – Prince Charles & Princess Diane’s (sic) Wedding Cake” which she signed and dated 29/7/81."