I'm looking forward to seeing the solution for this on 225 as there are several clues I cannot solve at all. However, with thanks to various posters here, I figured out the theme, but once I had done so, I abandoned it. I just found this to be one of the worst prize crosswords I've ever seen. I don't think that Google and Wikipedia should be the primary means of solving these crosswords.
Sometimes I can finish Paul but not always so I'm clearly not a top rank solver but I can live with that.
Incidentally, some of the 'hints' here (not all) are just as difficult to parse as the clues themselves. But that's OK, since it is a prize crossword, although of course it's easy for groups of solvers to work together online and all send in the solution.