Jean and I had, as I think a great many best friends have, a secret make-believe world of our own. We had only to say, ‘Let’s be Lilian and Diana,’ and, as though it was a magical formula, step straight into a world that was as real to us as the world of school and parents and cornflakes for breakfast. . . . In the summer after my father retired, Jean came to stay with me in North Devon. On the first morning, we retired to the rustic summerhouse. ‘Let’s be Lilian and Diana . . .’But the magic formula no longer worked. We tried and tried; but we could only _act_ Lilian and Diana; we could not _be_ them any more. I suppose the break had been too long, and we were just too old. We went on trying for days, searching for the way in. But it was like searching for the lost door to a lost country. Finally, without anything actually being said between us, we gave up and turned to other things. But with Lilian and Diana, something of Jean and Rosemary had gone too: left behind the lost door to the lost country. It was one of the saddest experiences of my young life.