Manator
©Honorary Essex Boy™
This is where advise is contradictory, you are correct the best practice is to record inspection results for like for like replacement, however if you replace a MCB like for like it can simply be recorded on your invoice that the work as been done with no test results required.If we alter a circuit in any way we hand over a cert. Even if just changing a light switch. As electricians we are putting that circuit we have just isolated back into service. We need to ensure it is safe.
Now that seems strange, and probably why when replacing a socket, switch or fused spur 99% of electricians myself included would not issue a minor works certificate.