What do you mean by polarised connector?
Non-reversible, so that line and neutral can be connected only one way round.
This sounds like an interesting idea, although to satisfy the requirements of most national codes these days any such wall-receptacle would probably need to include an earth/ground connection as well.
Britain used to use small 2A connectors specifically for lighting loads years ago, although the non-grounding (2-prong) types were unpolarized.
