I'm not sure about Cyprus requirements Spark?..& I may get a sparky in as it happens just because of that...I don't want to invalidate the house insurance etc.
I want to fit an new external/weatherproof double socket (without inbuilt rcd) ,which I already have, on an outside wall. I thought it would be a safe and relatively simple job to run, via a 13A plug, a short (<2 ft.) length of suitable cable from an adjacent internal socket..ie just straight through the external wall to the back of the external socket. I was going to buy an RCD socket (Timeguard TFA05W) to replace the normal socket that's there now..then I thought well Ive got a spare demountable RCD device already...why not use that?
This internal socket is neither visible nor easily accessible so the rcd would be permanently plugged in there out of sight..and would just be used to feed the external double socket. That socket is the only one on a radial circuit with a 16A mcb...and there's little chance of overloading it given what we want to use it for.