Got them all now although I'm still not too convinced by 9 and 19 and there seems to be some double duty in 17. But those are observations rather than even quibbles because I loved it overall, despite falling for some old chestnuts once again.
Thanks again for the tips (and the mind reading when I said NE instead of NW :-). For those coming after, my advice is to try extending which words are included in the definition. And then squint. Some really lovely lateral thinking required throughout. Thanks Picaroon.