Part P regs

[ban-all-sheds]

Difficult to know who/what you are replying to. What you say might be relevant to something I said later on but not to the "second part of my original question" which was

If there is a problem not found with simple tools (lets imagine a loop impedance too high for a short to be detected by breakers), how often does it actually happen? How many RCDs come with parametric failures straight from the box (as distinct from obviously broken)? etc

Sorry - you quoted me quoting you saying "So if a circuit is added and tests to BS7671 are not done on that circuit, essentially the question is - so what? (So long as a faulty circuit is not extended into a controlled zone.)" so I took "second part of my original question" to mean the second part of that.

My Bad.

 

[stillp]

Does the person replacing brakepads really have to inspect and/or test everything else relevant to safety on the vehicle?

No, they have to take reasonable care, and point out any defects they could reasonably be expected to notice.