"N" wrote in message
...
Chris

Are you suggesting that buried junction boxes and notched loits are
routinely checked before fitting new consumer units?

no they aren't - nobody would know where to start looking

the Regs are (maybe) a deterrent

all that's (maybe) done is an insulation test
which 'might' find a nail close to conductors
and a loop test to confirm that circuits reach the
consumer unit - a ring final test would be good.

I've seen testers walk around with hugely expensive
multifunction testers confirming everything good without ever
conducting basic tests like is a ring actually a ring

We were left with a sub circuit wired upside down
(live neutral swapped) by a power company !

Don't trust anyone