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Doh! Of course! Couldn't see the woods for the treen. Many thanks, all. And I agree with you actually about the last two weeks being too easy.
I sort of agree with you, too, Catron. I do enjoy finding new words and relishing an expanse of vocabulary (which unfortunately I also tend to quickly forget), but I'd much prefer it if they didn't make up half the crossword, and you could use your brain more than a dictionary to derive the solution. I put some of my rant down to a very hot and sticky Sunday as well.
Thanks again folks.