Unearthed Princess Diana letter that features young Harry and William’s signature goes on sale for £18,000

AN unearthed Princess Diana letter with scrawled signatures from young Princes William and Harry is on sale for £18,000.

The late Princess of Wales’ note thanks a police sergeant for putting on a motorbike for William’s seventh birthday party.

William signed his name in joined-up writing and Harry, then four, used larger, separated letters for his. 

The letter was dated June 21 1989 and written on official Kensington Palace paper. Auctioneers called it special.

Princess Diana 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."

Sgt George Plumb of the Metropolitan Police and the Special Escort Group put on the dazzling display for William, Harry and their friends on the grounds of Kensington Palace in 1989.

His team was already busy with engagements that day which were not helped by bus, train and underground strikes.

Auctioneers at William George, in Peterborough, Cambridgeshire, are selling the letter on January 10.

A spokesman said: "This letter comes personally signed by Diana Princes of Wales, H.R.H Prince William and H.R.H Prince Harry, dated 21st June 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 7th 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 with today.

"To have an item signed by Diana, William and Harry is quite special."

The letter left Sgt Plumb's estate six years ago when a private buyer bougth it.