Hi folks sorry not managed to get to computer.
I'm happy to say, all his results are within normal range
He could be accused of being slightly anaemic, but vet thinks this will sort itself out and is prob due to being run down at mo (having been treated for diarrhea, snuffles, and sore eye).
He thinks drinking prob due to diarrhea, and as diarrhea helped by special food it's possibly caused by food intolerance so keep him on that and see how go - poss try change to Burns or similar at later date.
So, I'm wrong about his kidneys and I'm pleased to be wrong! The extra blood tests were for pancreas and bacterial overload or something but when I collected him we discussed it and decided they were unlikely to tell us anything useful.
He seems to have recovered now from his sedation and his eye is looking a bit better too. he's not massively keen on the RC food but tummy just about settled again so fingers crossed we've just had a run of bad luck and he'll be healthy now indefinitely!
x