Why wouldn't someone want to vacuum up the dead flies and cobwebs in the loft? Vacuum cleaner gets plugged in, lighting circuit trips, and the occupant has to try to get down 2 storeys in the dark in order to reset the breaker and probably do exactly the same thing again, cursing the clown who installed the socket and thinking what a dangerous situation they've just been exposed to.
Of course you can put a sticker on the socket saying nobody is allowed to plug anything else in there, but that's just going to get ignored when the need to plug something else in arises.
I'd have less of a problem with this arrangement if there was another socket next to it, connected to the power circuit, but the whole reason for doing it like this is that there isn't, and as a result of that this socket is going to get used for anything that ever needs to be plugged in in the loft.