centre drilling is more to do with compression and tension of the joists which is minimal in the centre of a joist
Indeed, the centreline of the joist is neutral - neither in compression (top) or tension (bottom). That's why the regs say that's the only place its acceptable to drill them. Away from the centre of the span, there is shear along the centre line, but as long as you aren't drilling lots of holes close to the end then it's not going to be an issue.
Also, the fact that they are drilled at a steep angle hints at them not having the right tools for the job. There's no excuse really for not having a right-angle drill which would have allowed then to drill level and in the right place - the reason the holes are so low down is that they've used a straight drill at an angle from below the ceiling.
Unfortunately this is a reply I've recieved from the owner. It seems like I'm not going to be able to get through to him. What he is saying is just worrying to me.
Yeah, it's carp work, they know it's carp, but they have no intention of acknowledging that.
Do you know any builders who will do you a favour ? If you do, ask them if they'll do a quote to repair or replace all those vandalised timbers and ask the electricians how they intend to pay for it. If you are thick skinned enough to make them think you are serious then it will be brown trousers time for them when they realise how expensive their botchery is going to be.
What's the next port of call? NICEIC?
Anecdotally, good luck with that
But the first result in google when you search for "electrical regulatory body" is NICEIC - so they've clearly paid for it to be there.
Yes, they carefully construct a narrative that is designed to give the impression to the general public that they have some sort of legal standing in the same way that Gas Safe regulate gas works, and the BMA regulate doctors. Their material is also carefully worded to give the impression to the general public that using one of their members will give them a safe job, and that only their members can do that. I say carefully worded - sailing really close, but just not quite to the point where anyone could call them lies.
It seems like there's actually nothing out there to save consumers from rogue electricians. The average member of the public will see the NICEIC badge and think that means something (me included). Clearly it doesn't
Correct, there is very little protection. There's ample evidence that being a member of any of the scams, err registration schemes, does not provide any guarantee of quality work - and it's quite clear that there are non-scam members who can do safe and quality work. In Scotland they did a consultation on changes to the regs which would effectively give the scams the legal standing they want people to believe they have - by making it a requirement to be in a scam to trade as an electrician. All that would do is make the situation worse IMO.