I agree with Risteard here, the age af installation has nothing to do with it.
For a start there is no requirement in bs7671 for rcd protection for lights.
So I'm assuming that were talking about cables buried in walls <50mm without mechanical protection etc in which case it's a code 3.
For a start there is no requirement in bs7671 for rcd protection for lights.
So I'm assuming that were talking about cables buried in walls <50mm without mechanical protection etc in which case it's a code 3.