Speaking as a massive fan of Paul, I must say that was one of his hardest Prize CWs I've ever done. I didn't expect to finish & it was only when the penny dropped & I worked out what the theme was that I was able to. All parsed except 25a, which, despite the hints in the thread, remains a complete mystery - although the answer is obvious enough. I guess I'll never know! Just glad to get across the line in the end. Thanks for all the helpful posts.