CNN —Princess Diana’s letters to her family’s former housekeeper are going on sale, providing an “insight” into her life behind closed doors, including wedding preparations to the then-Prince Charles, and details of Prince Harry and Prince William’s childhood relationship. “[Collison] was a constant in Diana’s life, and remained so all her life,” Luke Macdonald, head of art and estates at Sworders, told CNN Thursday. “They were very close,” said Macdonald, adding that the two would correspond for birthdays, Christmases, and even before Diana’s wedding to then-Prince Charles. One letter dated July 8, 1981 – three weeks before the royal wedding – was handwritten by Diana on Buckingham Palace stationary, telling Collison about the pre-wedding preparations. Another letter, written 10 days after the birth of Prince Harry in 1984, thanks Collison for a gift she sent the newborn.

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