Thanks - that's interesting and good to know! I've spent an hour or two trying to make up something which will do, and I'll haul my daughter out of bed soon (she's making the most of her holidays before starting university!) and she'll probably be able to help me fix it up a bit better.

And I knew you were a friend of generalblossom's, but also you've been on one of my rings, I think. (Trust her on Kilmeny - though interesting as a truly awful book, if you're ever in the mood! ;) )