Yes, I had wondered about the Harfang inscription! And the theory about Digory makes as much sense as anything else, really. Although it does not explain why tea and biscuits and sausages are to be found in Narnia...

I just love how very medieval the Lady is, in contrast to Jadis. They clearly want the same thing, but they go about it in a very different way. And drawing a connection between them like that makes it all make sense.