" When Prince Charles arrived home from a recent private visit to France she found his presence so oppressive that she literally ran out of Kensington Palace. Diana phoned a friend who was grieving over the death of a loved one. She could sense that her chum was crying and said: “Right I’m coming over now.” As her friend recalls: “She came instantly for me but when she arrived she was visibly unsettled. Diana told me: “I’m here for you but I’m also here for me. My husband appeared and I just had to fly out and escape.’ She was all of a dither.”
As far as is practicable they lead separate lives, joining forces only to maintain a façade of unity. These reunions merely give the public a glimpse into their isolated existences. At last year’s soccer Cup Final at Wembley they sat next to each other but never exchanged a word or glance during the ninety-minute game. More recently Prince Charles missed his wife’s cheek and ended up kissing her neck at the end of a polo match during their tour of India. Even their notepaper which used to have a distinctive intertwined “C and D” has been discarded in favour of individual letterheadings.
When she is at Kensington palace he will be at Highgrove or Birkhall on the Balmoral estate. At Highgrove she has the large four-poster in the master bedroom; he sleeps in a brass bed which he borrowed from his son, Prince William, because he found its extra width more comfortable after he broke his right arm during a polo match. Even these distant sleeping arrangements have led to marital discord. When Prince William asked for his bed back, his father refused. “Sometimes I don’t know who the baby is in this family,” commented Diana caustically. The days when she affectionately called him “Hubcap” are long gone. As James Gilbey notes: “Their lives are spent in total isolation. It’s not as though they ring each other and have sweet chats each evening and say: ‘Darling what have you been doing?’ It simply doesn’t happen. "
― Andrew Morton , Diana: Her True Story in Her Own Words