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A collection of 40 letters and greetings cards written by the Princess of Wales, dating between 1990 and 1997, will be available for the public to bid on at David Lay Auctions.
The letters have been assembled into 36 different biddable lots, and have a guide prices from £300-£500, up to £1,500.
And the collection of writings provide a fascinating insight into Diana's warm and likeable personality, which saw her come beloved across the world.
In one letter to pal Roger Bramble, dated 12th June 1992, Diana describes she's having "a ghastly week" - coinciding to when Andrew Morton's biography on her life was being serialised in the Sunday Times newspaper.
In other card, she writes how "desperately unfortunate" it is that she cannot see a friend for lunch.
"Please forgive and suggest another date," Diana has written, alongside a wobbly smiley face.
Speaking about the personal letters for sale, Mimi Connell-Lay, who works at David Lay Auctions in Penzance, explained: "She does come across as an extremely warm, witty, funny, charming and generous-hearted person and I think that is the main motivation for them being sold.
"We've been getting emails and interest from around the word, particularly in America, we've had quite a few enquiries from India."
Proceeds from the sale will be donated to organisations with which the princess and Mr Bramble had a particular affinity, including the English National Ballet and the Young Musician's Symphony Orchestra.
In other royal news, Prince William's children made cards for "Granny Diana" on Mother's Day.
Prince George wrote "Happy Happy Mothers Day" to "Granny" Diana, and Princess Charlotte's note said "I am thinking of you."
Prince Philip was also discharged from hospital earlier this week after a month away from the Queen.
A Buckingham Palace spokesperson said: "The Duke of Edinburgh has today been discharged from King Edward VII's Hospital and has returned to Windsor Castle, following treatment for an infection and a successful procedure for a pre-existing condition.
"His Royal Highness wishes to thank all the medical staff who looked after him at both King Edward VII's Hospital and St. Bartholomew's Hospital, and everyone who has sent their good wishes."
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