fosteronfilm got a urine sample from Hobkin to the vet's for testing the other day, and the results just came in. Elevated white blood cells and some blood. Also some cells that could be bad if there were more of them, but are normal to see in cases of inflammation.
The vet is now sure Hobkin has an infection. We just need to keep him on the amoxicillin, and all should be well.
Vasty gobs of relief and happiness.