Note of thanks from Diana and sons on sale

THE signatures of princes William and Harry when they were seven and four years old were scrawled on a letter written by Diana, Princess of Wales to thank a police sergeant.

The brothers added their names to the bottom of a handwritten note penned by their mother to George Plumb, who arranged a motorbike display for William’s birthday party.

The letter, dated June 21 1989 and written on Kensington Palace headed paper, has emerged for sale for £16,000 after Sgt Plumb gave it to a private collector three years ago.

Sgt Plumb, of the Metropolitan Police

and the Special Escort Group, put on the display for the princes and their friends in the grounds of Kensington Palace in 1989.

The letter reads: “Dear Sgt Plumb, It was so very kind of you and your team to have come here today on William’s birthday – I cannot begin to tell you what pleasure the display gave to all those little people and their mothers!

“I know how particularly busy you all are at the moment, so it meant even more to us that you and the motorbike boys were able to take part in the birthday celebrations! This comes with our warmest possible thanks. Yours sincerely Diana, William, Harry.”

The comment about the team being

“busy” refers to the fact that there were public transport workers’ strikes taking place in London at the time, affecting rail, Underground and bus services.

The letter is being sold by auctioneers William George Auctions of Peterborough, Cambs.

The company said: “It is on Kensington Palace headed paper, addressed to Sgt George Plumb Special Escort Group in Diana’s handwriting.

“It thanks Sgt Plumb and his team who put on a superb display by the precision motorbike display team of the special escort group, for Prince William’s seventh birthday.”

The online auction

April 23.