Prince Archie and Princess Lilibet have to follow an unusual royal Christmas rule which prevents them opening their present on Christmas Day. In his controversial memoir Spare , Prince Harry revealed how the children open their gifts on Christmas Eve , in a nod to the family’s Anglo-Saxon heritage.

Harry goes into detail about the Christmas tradition in the memoir. He wrote: "The whole family gathered to open gifts on Christmas Eve, as always, a German tradition that survived the anglicising of the family surname from Saxe-Coburg-Gotha to Windsor. We were at Sandringham in a big room with a long table covered with white cloth and white name cards.

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