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Nice topic for today and not too strenuous

Agreed. As soon as I read the preamble I dug out the required poem. It's one I've always liked.

Agreed. Thank you, Stick Insect.

26D Fold in rock introductory section (5) Hints, please, for the unchecked 4th letter. I'm sure the ones I have for the other four are correct but can't make out the whole word.

2 letters for 'rock' (volcanic) around 3 letters for 'fold (over)' - def 'intro...' is musical.

Got it. Thank you drxx - it was driving me crazy. It was in Chambers all along but I spotted only the four-letter version when I trawled through it.