As far as I know, they have removed his left thyroid gland. This was enlarged so had to be taken out. And yes I was so pleased to see him I didn't take much notice I have to admit! But no really he should make a full recovery. There is a chance that in the future his other thyroid gland could also do the same thing, but we'll have to cross that bridge if we come to it.
He literally jumped out of the nurses arms into mine and loved me and kissed me and started purring his head off, the nurse was actually quite taken aback and went' awwwww' hehe so I think he charmed everybody whilst he was there.