I've got a stomach now as well as a behind. And I mean - well, you can't pull it in both ways, can you? ... I've made it a rule to pull in my stomach and let my behind look after itself.
Many friends have said to me, 'I never know when you write your books, because I've never seen you writing, or even seen you go away to write.' I must behave rather as dogs do when they retire with a bone; they depart in a secretive manner and you do not see them again for an odd half hour. They return self-consciously with mud on their noses. I do much the same.