RCD Protection - Additional Sockets

[arb1]

My mother currently has power supply to garage (light and 1 socket) cabled directly from the main fuse box. The current socket is an RCD protected socket but it is a really awkward place for access in a corner (my mum is disabled) and I would like to move it. The actually moving of the socket shouldn't be a problem since it should just mean shortening the cables/conduit and rewire/reposition the socket. What I would like to know is would it be possible to add an additional socket to the current socket which has RCD protection and if so would any additional socket running from the RCD socket be also be protected or would it need its own RCD protection. Alternatively would I be better off putting in an RCD FCU and running 2 "normal" sockets from that. There wouldn't be much of a load on it. Its just so there is one socket at the back of the garage and one at the front. She needs power to charge her battery for mobility scooter a couple of times a week and for when the carer cuts the grass and I would use it occasionally for power tools when she wants something done.

 

[ricicle]

If the existing socket has built in RCD protection then any additonal socket(s) will not be RCD protected.
If the circuit is RCD protected from source (or before any sockets) then all sockets after the RCD will be protected.

 

[arb1]

So an RCD spur looks the preferred option then as I'm not entirely sure there is an RCD on the main CU, it's about 40 years old and has a trip switch but as the current socket in the garage has an RCD I have assumed not.

Maybe I'll get someone to look at the main CU with a view to getting it upgraded.

 

[dhutch]

Might well be that the RCD socket was added in addition to the CU RCD but without looking at the CU it is impossable to say.