Thanks mersault, very helpful as always. I have now given up solving unaided and read the thread. I now have all the answers but it looks like filling the grid is still a slog so I’ll give up. Second miss this year for me (messed up the snakes one). Still 90%+ success rate so far this year, up from 75% last year and just over 50% the year before that - experience and practice do seem to work.
When I saw it was Sabre I thought don’t bother, they are always a complete waste of time. Then I cracked a few clues so wasted six hours cold solving 27 clues. Then I gave up. I won’t be making the same mistake with the next Sabre, I shall be treating them like some people treat the numericals from now on.