Got the majority of the results back this afternoon and it would seem we are dealing with a kidney problem
I wasn't expecting any abnormalities in the blood work up as he appears fine in himself and he isn't even 3 years old. Although the levels are above normal reference range, they are not massively increased so I am going to put my optimistic head on
The vet is going to wait for the remainder of the results to come back before compiling a plan of action - hopefully there won't be any other nasty surprises to come
Should have them in the next day or two.