OK, thanks. I still haven't identified Y or Z. I've solved all bar number 2 which I guessed from all the other thematic material but I've no idea how it's derived from the picture clue (apart from the last word) so a hint there would be good please.
The other thing I was going to ask was what's meant by "1 Down" in the second sentence. But, even as I've been typing I've realised what it is (clever). So I assume that Y is the individual referred to there?
I can't see which item is doing double-duty to provide Z. I've tried Googling all the combinations with nothing leaping out at me.