Failing insulation resistance

A

apdevelopments

I went to quote on a simple job today.
Some old by is buying a new cooker and wants the wiring ready.
I carefully pulled out the old cooker to see what was behind and all there is behind is a 10mm cable coming out of the wall.
I recommended to fit a proper cooker connection point, Sink the single box in the wall where the cable comes out. Nice and easy.
He was happy with that as it wouldn't affect his wall paper behind the cooker.
I was planning to issue a minor job certificate for this job as its such a simple job.

We are talking old boy here so not alot of money to spend.

I was able to fit him in today so after the go ahead I set about testing the circuit before I go in for the attack.

Out comes the meter and I fully test his cooker circuit.
I always test before I do anything to double check that everything's ok before I start.
So continuity 0.17 ohms Ok.
Insulation resistance. Line and cpc: Pass. Line to neutral FAIL!!!! CPC to neutral: Pass!

Everything was disconnected at each end. Consumer unit to cooker switch.

He is still using his old cooker right now as I didn't start the job and just put everything back.

He is still using a old 1960's fused Wylex consumer unit.

I did mention upgrading his consumer unit but like he can afford it. probably not.

Cable is burred in plaster so threes not much to see and its a 30 meter run from consumer unit to cooker.


What would you do in this situation?
 
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