Like most people of their generation, they have not been able to see much of their great-grandchildren during lockdown. 

So it was with understandable delight that the Queen and the Duke of Edinburgh received a card made by Prince George, seven, Princess Charlotte, five, and two-year-old Prince Louis to mark their 73rd anniversary, which falls on Friday.

Prince Philip, 99, is pictured holding the colourful A4 creation as the 94-year-old monarch looks on in a touching image taken as the couple continue to self-isolate together at Windsor Castle.

They were photographed in the Oak Room earlier this week by Chris Jackson, of Getty Images, as they browsed the card from the Cambridge children along with others sent by well-wishers around the world. 

Dressed in a pale blue double wool crepe dress by the royal dressmaker Stewart Parvin, the Queen gave a nod to the couple’s honeymoon by wearing the Chrysanthemum Brooch. 

When Princess Elizabeth, she was pictured wearing the platinum-set sapphire and diamond brooch at Broadlands in Hampshire, where the newlyweds holidayed following their Westminster Abbey wedding on November 20, 1947. She wore the piece again in images taken to mark their 60th wedding anniversary in 2007.  

The couple are expected to mark the occasion privately.