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Too easy overall, but I can't see how 20d fits with the theme, or is it missing a clue?

20d is thematic. It (or rather they) are recent.

Gawdelpus, I may have stumbled upon the same article you reference; one written by Doc to mark a 50th anniversary. Actually very interesting.

Ah, thanks. My bad. I printed off the puzzle in a rather faded black and white filter and then lightly crayoned in the shaded cells by hand for completeness. Bungled it on the yellows. No loss, just a red face :)