Laughing and giggling as they hold their heads above the sand, it’s the kind of happy holiday snapshot that graces family photograph albums in homes across the country.

Only the corgi sitting between the two children suggests that they might not be any old family after all.

Pictured on glorious Holkham Beach in Norfolk in the summer of 1957, Prince Charles and his sister, Princess Anne, smile for the camera after being buried up to their necks by their father, the Duke of Edinburgh.

The charming picture is a still taken from home video footage shot by the Queen herself.