Thanks all for your hints (to date). This is one xword I am getting very cross about as puck is way over my head. Maybe I am not parsing the sober clues properly.
e.g. 25d I thought the answer is the partner of Sooty;
So I thought 31a began with the letter P and ended in Y. That can't be if this clue is a non-sober one as Y doesn't fit into the equation; well it does if it's the unknown.
so far I have never tasted Puck's choice of 26 downs as they are not my kind of 26 down although I still have a few more to find.
So for me it's off to the fridge for my own kind of dry white 26 down.