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I'm sure someone else can give more detail, but I think building control can only serve an enforcement notice up to a year after work is finished. There other routes they can take (injunctions and straight up prosecution) but think they are rarely if ever used. In other words if you are planning some dodgy work, make sure you do it more than a year before you plan to sell, then you can just buy a useless indemnity policy...
How long does something have to have been complete for, for building control to not have to sign it off? I'm assuming there's a limit or Building Control would be telling people in thatched cottages to fit firedoors, but that's an assumption.