It might be referring to the "daisy chain" wiring, which means that every plug has the fuse inside the actual plug itself. This is why UK plugs are so huge. The

It might be referring to the "daisy chain" wiring, which means that every plug has the fuse inside the actual plug itself. This is why UK plugs are so huge. The reason for this is after WWII there was a copper shortage and it was cheaper to wire houses this way.