Pattie Boyd found it “draining” to write her autobiography. The 77-year-old model and photographer wrote ‘Wonderful Today’ about her marriages with the late Beatles star George Harrison and 76-year-old musician Eric Clapton but admitted that while putting pen to paper was not an easy process she is ultimately “glad” that she did. Speaking on the ‘Tea with Twiggy!’ podcast, she said: “I found it quite draining. Venturing back to areas of your life that are not very comfortable was difficult to talk about as well. I know people say it’s cathartic, but I hate that word because I don’t quite know …