I have finally managed to update the blog, but it was a complete nightmare - apologies for all the test messages. I don't know whether it's the Blogger service or me. For some reason the underlying HTML of my posts was unacceptable, although I wasn't doing anything different and I couldn't see what the problem with the HTML was myself. Anyway, apologies for the odd formatting on some of the posts. I daresay I'll get to the bottom of it all eventually.