Someone suggested I’m in the trade – not quite true. I work for one of the electricity companies, started as an engineer, now Head of System Design – but to be honest I don’t deal with house wiring professionally.
What I do see professionally is the amount of time, effort and thought that goes into British Standards by some very gifted people. Incidentally the British three pin plug and socket is possibly one of the most over engineered pieces of equipment ever – thought the Euros don’t like it because if you step on it in bare feet (the plug that is) it hurts (and I can see their point).
Trust the British Standard, and for my money buy a decent quality socket (I like MK) and you are better off than with socket covers. If you must cover the socket, cover the whole thing, without sticking anything down those three holes.
The fatally flawed / Adam Hart-Davis thing is worth a look.
If you still don’t agree with me, then I’ve got an unopened pack of those socket blanks somewhere (yes I got suckered in as a new dad too – but I didn’t actually use them once I’d had a look at them) and the first email can have them for postage.