Many thanks for all your hints. I managed to finish the crossword with a couple more helps from DanWord. There were a number I couldn't parse at all or couldn't fully parse.
10ac I got the pointless political leader, but not the rest
11ac I got the first three letters but not the rest
12ac I got the country, but can't parse the rest of the clue
13ac I have the answer, but don't fully understand it.
15ac Where does the President come in?
24ac I have a word that fits the crossers, but have no idea why it is right.
8d Where does the third letter from the answer come from?
9d I can see the definition, but the word play has defeated me.
24ac I have an answer, but cannot see the bilingual bit.
Too many to answer I think.
FOI 2d, COD 24ac, CODs 4D, 25ac and 1ac