Having recently bought a freezer to keep in the garage, I needed an extension lead to connect to the only permanently live socket (for my car and tool battery chargers) in there (the rest are switched at the door and I've already walked out and accidentally turned everything off through habit).
I would have installed a permanently live socket, but I am intending to do a load of work on the garage during next summer (if materials prices are not still outrageously high).
I was going to go out and buy an extension, but saved myself the trip (and 8 quid) by looking in one of the heaps in the garage, where I found a spare plug and a 2.5m cable with a 1-gang socket on the end. Perfect.
Plug fitted to cable in a few minutes, freezer connected and all was well.
However, I have no idea where that lead came from or how long I'd had it lying around ... except that it definitely pre-dates the mid seventies, as it uses red and black cores and a green Earth! It must pre-date me owning a house by 20 years!