I managed to bag myself some new-in-box 5Amp BS546 sockets on ebay yesterday, and they're vintage ones, the proper surface-mount-on-the-skirting-board sort, so, the part yet to come is wiring them up to be useful...
I've fiddled with such sockets, in a local am-dram theatre's stores, mounted on what was probably an offcut piece of floorboard, and they were in a set of three, but these were positively ancient and used old rubber wire in the Black-Red-Green standard, so I didn't actually use them for safety reasons, but they were neat little things, I wish I purloined them before they cleared it all out...
So, should I do something similar and have them on the end of a 13Amp plug, or do something a bit more elaborate?
I wouldn't mind finding some 15A sockets of a similar vintage, but that's for a later date...