A never-before-seen letter written by Princess Diana is now up for sale.
Starting at a whopping £18,000, the letter is written by the then-Princess of Wales and includes the signatures of both Prince William and Prince Harry, who were ages seven and four.
Their signatures, although a scrawl then, can be seen at the bottom of the page.
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Sent from Kensington, it was written for a police sergeant thanking him for organising a motorbike display for William’s birthday.
The letter, dated in the top right corner, is from June 21, 1989, written on William's seventh birthday, reports the Express.
Sergeant George Plumb of the Metropolitan Police and the Special Escort Group are believed to have put on the display for the two brothers and their friends on the grounds of Kensington Palace in 1989.
The late princess wrote: "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 princess, when writing the sergeant is "particularly busy" is believed to have been referring to bus, train and underground strikes staged at the time.
Auctioneers at William George, Peterborough, called the letter very special and plan to sell it on January 10, 2023.
A spokesperson for the auctioneers said: "This letter comes personally signed by Diana Princes of Wales, H.R.H Prince William and H.R.H Prince Harry, dated June 21, 1989.
"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.
"She was particularly grateful to the team for being able to fit this on a day already full of official engagements, which was not helped by the rail, underground and bus strikes, something which strikes a chord today.
"To have an item signed by Diana, William and Harry is quite special."
The letter was bought from the sergeant by a private collector around six years ago.
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