Friend asked me to comment on the electrics (just bought an house)

Everything looks OK but one thing concerned me.
The CU is mounted approx 6ft high in the utility room and the tails
run done the wall approx 4ft buried in the plaster then pass through
the wall into the back of the meter box. They do run down the corner
of the room within 150mm but I just couldn't help but think what would
happen if someone was to drill or drive a nail into the corner with
nothing other than the Mains 100A fuse to protect them (one hell of a
big bang)

Anyway I pointed out the danger to them but I don't know if any ules
or regs have been broken..

Advice, Opinions and comments most welcome.
Andy