Plug sockets are about the only thing in my flat which aren&#x27;t based on obsolete standards - general consensus is that the blocks were lashed up by cowboys. Which makes it a right bugger when you want to replace a bathroom tile (can&#x27;t - they stopped making that size about 25 years ago); replace the oven (no-one makes them that narrow any more); replace the toilet (cistern is in another room); etc. etc.