OP
mogga
If you look at the definition of an EIC the very first point tells us that it is to be used for an new installation or an addition or alteration where new circuits have been introduced.
So the moving of an existing circuit be it for the sockets or lights will all come under an MEIWC. As it is 2 circuits then you need to do 2 different certs for it.
Now for the sockets you will need to provide RCD protection if you are burying the cables that contravene regulation 5266.6.6 and 526.6.7. As for the sockets themselves, well IMO it's a technical point if your moving 3 sockets say and re-fiting those 3 sockets in just a different location, do you have to provide RCD protection, I suppose technically it should be yes .............
The lighting circuit again will come under the cable regulation and if you contravene it then you will need to provide RCD protection.
What all this work will need though is notifying under Part P
If your adding an RCD it will require a full EIC for the circuit If as you say the full house is fed via the kitchen socket circuit Id personaly rewire and from my understanding of PartPee it IS notifiable as you are al;tering the original
Are you qualified to do this or could the not being qualified be why you are asking questions as to get round certs and notification???? the L.A. building control wont take " I checked with the electricians forum" as an excuse if you get caught out