HMO earthing arrangements.

[Darkwood]

I have worked on several HMOs of different sizes and configurations, and I have come to the conclusion that it's best to to speak directly to the local council's HMO inspector, as he will be the one signing it off (or not).

I assume you refer to building control, unfortunately it is pot luck with them, many just want that certificate of compliance signed of by the electrician and their backs are covered, others however will seek advice from other sources and it comes down to how accurate the source is, many people simply do a belts and braces attitude to cover complicated requirements regardless of the actual requirements been demonstrably satisfied.
I have had many a run in with building control and tbh I now find if they tell you that is what is required it is better to simply ask for written confirmation and get on with it as long as you have a paper trail, many a time I have proven them wrong but this loses them face and causes issues further downstream... they are a rule to themselves, although I have met a few who are genuinely there to help and will take critique and listen to your reasoning.

 

[westward10]

As you say one meter, one source of supply therefore one installation and one set of main protective bonding. Your analogy is correct in #10.
The only mistake you have made is contacting a scheme with an optimistical view that the person holding the phone is actually more knowledgeable than yourself.

 

[Darkwood]

@westward10 - not my mistake, this was done by the other team on site who disagree with me, I am not at all surprised tbh if they are not getting the right info back but I suspect they have not been very clear of the circumstances for the scheme to give that response in the first place but it wouldn't surprise me in the slightest if they were indeed just dishing out belt and braces advice.

 

[Rockingit]

No different to any other building with one source of energy and a bunch of submains. Go for it.