@coracle: @waggawerewolf27So do you think a narrator in MN should be a woman?  Or not to have a narrator at all?

There are bits of MN where Polly is absent, such as when she is sent away in Uncle Andrew's study at the beginning. It would have to be Digory, explaining his encounter with his uncle, and also when they return with Jadis, and then he is left alone with Aunt Letty and the housemaid. Similarly, there are bits to let us know what Polly is doing when on detention at home. In Narnia, they are seldom parted, and it was Polly's sweets which caused the toffee tree to grow. 

When we are told at the end of the book how they ended up as lifelong friends, perhaps if any narrator is needed it could be a joint effort - one of those "remember when" moments, they could have had at any time in their lives, even before the Pevensey children appear in LWW. Until LB, right at the end, we don't see Polly at all. As a matter of interest, we don't know much about Polly or her life, and it is only as a young girl, in MN, when she meets Digory, that she plays any major part in the Narnia saga. And, of course, as friends, the bits she can't have known about at the time, she would have been told about, later. 

So, yes, perhaps the narrator could be the eventual Polly in LB, but it doesn't have to be so specific.