I haven't seen Boatman for some time and recalled him/her as a difficult setter for me. In the event I was surprised at the number of easy ones that I filled in on first read-through. Then I got a few more until I arrived at the impenetrable ones. I have answers for all the clues, but was unable to fully parse several:
12ac - I don't understand the explanation given above
22ac
24ac - what has the disgraced president got to do with the answer?
29ac I still can't parse this despite the thread
7d - thanks for the explanation on thread
16d
25d - I'm not sure what the acronym is
There were a couple of answers that I had to google as I'd nver heard of them.
FOI 10ac closely fo;;owed by 19ac, LOI 25d and CODs13ac, 26ac, 3d and 24d
I can't see the theme