Not really, smellyharry - they are 4 Ys, not parts of a single Y (at least as Chambers defines them) but it's a tiny negative in any case, and didn't spoil my enjoyment of the puzzle.
I had issues with some of the clues - 18a, 27a and 26d, for example - but only one of them has been mentioned (26d, I think) so either I'm missing something or Shark is being given rather more leeway here than most other setters get. If it's the latter - I wonder why? If it's the former, please accept my apologies (but I'll leave it there).