That’s buried in the wall?
I’m guessing 70’s or 80’s build… so there should be cpcs in every cable, even the lights.
On the cable where there is no cpc, is it just cut off short, or not there at all….
Agree with Westy, looks derelict.
You could, if they don’t want a huge expense, is to rewire in pvc trunking on the surface. Looks crap, but it’s a possibility for a temporary solution.
A full rewire includes a lot more with making good afterwards