You cant call him a conspiracy theorist and then say you made half of it up. He is of course right though, if you get work done and don't notify it zero will happen about it, no enforcement, nothing. thousands of notifiable building works go unchecked every single day from a replacement window to a full extension, the councils have neither the resources or the interest to follow any of them up.
The only reason part P is asked for so much is because the media propaganda has reported that you will be unable to sell your house if you haven't got all the required paperwork in order which includes electrical sign offs, the scammers have spent the budget on scare stories instead of actually improving the sector. This is of course rubbish, at least 40% of house buyers are cash buyers and they can buy whatever they want cert or no cert and as for the other 60%, well I'd be surprised if too many mortgage companies wer that arsed either,