We took Oliver to the vet last week because he's been a bit off, weeing and drinking more than usual. The verdict is that he has hyperthyroidism and also the beginnings of kidney disease :(

He is elderly - at least 15, maybe older, we don't know for sure - and so I suppose he's done well to get this far. But still. He's on medication for the thyroid, started on Saturday and it's disagreeing with him; he's eaten nothing tonight and thrown up a few times. My poor little boy :(