I'm back having read through the thread. It took ages and the undefined theme (what a pain) took me ages to unfathom. But I've now got a google list and can go away and try again.
I should have guessed it through 21d. I think the homophones in 25ac are awful. I had guessed the answer, but couldn't parse it. I'll have another go.
I'm off the wine at the moment so can't recourse to that for help.
Sorry, but I don't like Boatman.