Thanks, both! You're kind.
Now I just have to improve my printing skills so I don't block up the shadow on the right. I've not managed it with Bamboo, that's for sure. I'll try GFS. Oh, it all makes work for the working man to do, as Flanders and Swann sang.
Jeremy
PS: in case anyone's interested, it's the Bridge of Sighs in St John's College, Cambridge, taken from the New Court cloisters last weekend.