geeker - I have to say that very soon after starting this one I felt uncommonly tired as well, and almost threw in the towel for the night. I’m glad I persisted though, as unlocking a couple of key clues led to the remainder falling into place very satisfyingly.
I agree that 15 was’ very clever, and produced a rueful chuckle when the penny dropped after staring at it for what seemed an age.
Incidentally, the clue at 22 is sadly topical given recent events over here, which I presume have occurred some time after Paul finished setting this. If only they would flee at great speed, and for good. Enough said. (Though re the clue, I would suggest that it’s perhaps unfairly general, especially for non-Brits).