Doing a partial rewire at the moment in a large Victorian house. The dining room wall lights that I've now removed were wired in VIR with no cpc (despite everything else in the house being rewired 20 years ago), the wall fittings were brass, the insulation on the line wire inside 2 out of 3 of the wall lights was so decayed it was virtually non existent, and to top it all off, the plumber did his work before me and shoved his brand new copper pipes under one of these cables in the ceiling above. When I found it there was no insulation left between the line conductor and the pipe it was touching. Lucky no one decided to switch the lights on when he was working above!!!