Hi Rocky and others
Well, much to my surprise, I've finished. I got in the washing and filled them all in. Thanks for all the hints, though when I got them I realised that I had already thought of that answer, but couldn't see why. Lots of hidden definitions didn't help. My LOI was 5d, which for some absurd reason took me ages, but was obvious. I'd never heard of 3d as my knowledge of golf is much lower than my poor knowledge of football. I spent ages trying to think of a virus from which I could drop an "I" before hitting on the much more obvious one for 10ac. I still haven't completely parsed one or two.
As I said before my FOI was 15ac. My COD is 18ac, closely followed by 9ac.
At least now I can get on with my patchwork.