RCD Requirements minor works

[telectrix]

Yes as your installing a socket outlet with rcd protection.
the work you undertake must comply with the current edition of bs7671

but if you are feeding that new socket with cable buried in wall <2" deep, then 522.6 needs to be complied with.

 

[Ian1981]

but if you are feeding that new socket with cable buried in wall <2" deep, then 522.6 needs to be complied with.

Cables not directly in a wall according to the OP.
Threads a week old I think so can't Remember