This book was one I was lent as a child when I was in hospital, and I never got to finish it, which is why I think it has stuck in my memory.
It is set on an island, I think, where the boy hero has been marooned. He finds a cave to shelter in, and although he hasn't seen anyone else he finds either some milk, or a coconut with milk in it, outside the cave one morning. There is a girl who leaves it for him, and calls "Milko" or, something smilar, when she does. That's about all I can remember, I'm afraid.
It has bugged me for years as to what the book was, so any help would be much appreciated
