BBH I had a feeling this wouldn't be a day job, certainly not for somebody in Andy's position. Private hospitals don't turf patients out like they do on the NHS. Also it's best that he has time to get over the effects of the GA and the procedure in a medical environment. He might require very strong painkillers for a day or two as well.
Aileen, just out of interest, I was reading something a bit earlier about microdiscectomy procedures, which is what Andy is rumoured to have had. It said that patients having a microdisectomy don't always have a general anaesthetic. I was quite irrationally relieved about that because in my experience of surgeries the GA was always the most vile bit, it used to take me days to get over that, let alone whatever surgery I'd had. Andy is fit, which helps, and GA's have improved somewhat since I last had a surgery, but still. They are not nice.
What I don't recall is the thing I read saying what anaesthetic could have been used instead, but my limited knowledge of medical procedures latched on to an epidural or something like that, which could take a few days to get over in itself, if it is the case. Let's just say that if Andy did have an epidural he won't be going anywhere this evening, which won't do him any harm at all.