I'd venture to suggest you are over complicating matters...
Walsall guage plug, I believe. Allegedly still used in the BBC, or was it London Underground?correct me if my eyesights wrong tel but isn't that plug on the right you've put up ilegal? tut
I love a nice grid myself with marked 20 amp switches saying what they do, I like to put the grid on a 20 amp ring main supply for the appliances and have general sockets (ie toaster/microwave liquidizer)on a seperate ring, there are some lovely looking flush plates today which are very nice.