A medical procedure that has been carried out on unsuspecting animals and stuff but not exactly the sort of thing that takes place on a regular basis.
Unless of course you are a character in a British soap opera. In which case walking down the road, disappearing for two-weeks and then returning with a new head is as common as a colony of rats gnawing their way through the backdoor of a London takeaway establishment.
Not only that. The medical procedure is so good that everyone living nearby doesn’t even notice they have a new head!
Incredible! Unbelievable! Like most of their plot-lines.