There are 32 letters and cards that were written between 1995 and 1996 to her friends Susie and Tarek Kassem. The private letters from Princess Diana reveal she wouldn't have agreed to separate if she knew it was going to be so 'desperate and ugly.'
In one revealing letter from April 28, 1996, Diana cancelled a trip to the opera as she found it difficult to go. She wrote: 'I am having a very difficult time and pressure is serious and coming from all sides.
'It's too difficult sometimes to keep one's head up and today I am on my knees and just longing for this divorce to go through as the possible cost is tremendous.'