Well I’m away so printed out the wrong Paul one. The pdf has now been corrected to Kite’s I see. When Paul’s is eventually published I strongly suspect a couple of the clues will be reworded. I’ve struggled mightily and still have two left. One I can guess but can’t parse, the other is a six letter word of which I have three letters and no solution in the English language fits the clue (I think, though of course could be wrong).
19d - If I've read it correctly, the "couples" just reflects the fact that the answer is plural so, instead of having 1 person "retiring" (or going to sleep) you have 2 - or more, whatever floats your boat!