Steve Firth wrote:
Michael Chare wrote:

If the installer was Ms Tonge herself then the error may perhaps be
understandable. OTOH I can't see how someone managed to install the rack
without electrocuting themself.

If the drill bit just hit the live wire you might not get a shock because

a) Quite likely holding onto plastics parts of drill

b) Possibly not touching any other earthed item.

Birds sit on live wires everyday without ill effect!

Yes, then you have a screw to get into place while holding onto the
metal rack. How does that work?

Last screw, with it sitting on the bit of the screwdriver held
in aforementioned insulared drill?