Just FYI... Second time I've done this.

First time, about 12 years ago, they turned for first fix and said "wires are nice and straight, don't bother getting us back till you're all done", and then swapped the EIC I completed for a completion cert - and that was it.. To be fair, the BCO back then was quite plain that they didn't want the Part P work, and didn't know anything about electrics - I suspect he was just looking for good vibes and would have got a sparky in if he felt it was needed.

This time they refused to let me operate the same way as last time, insisted on testing it, and charged me a lot more. Ho hum. But they did send a real electrician this time, who actually did some testing. He still did less testing than I did last time - e.g. he just looked at the main bond, didn't test it - and although he was doing something with the DB, he never turned the whole power off, so either he's a lot braver than I am at working in partially live conditions, or he skipped some other tests. So about the same standard as every other type of buildings inspection, but better than last time.