If you want to do everything by the books it's very bad, almost Australian level - which is why I find the latter part of the quote weird, as I know the legal definition of electrician in the UK is for most purposes "anyone who in good faith considers themselves competent to perform the specific job" and the only mandatory safety regulation being Building Regulations Part P (as well as the notification rules which are pretty much a tax on non-scheme labor by another name)...
Anyway, the market for building "parts and labor" went to shit and still hasn't recovered so consider that while estimating prices and times (not because of covid, in part because of the governments' reaction to it, more importantly because of the superbonus scam*)
* Government will rebate 110% of cost incurred for house improvement work as long as it improves sufficiently the equally stupidly "calculated" energy efficiency class! If you qualify you can even tack on some additions with a 50% rebate!
Apart from obviously causing price hikes, it requires both the house and the work to be legal in the first place (their interest) and, wait for it, it can be retroactively canceled at any time in the next 6 years for irregularities and the owner (who still ultimately ordered the work) assumes all direct risk!
I still hope that will happen to this house for schadenfreude against those who voted for it and the still ongoing hassle it's causing
Oh yeah, subappalti (outsourcing), creative accounting, corruption (aka Italian Solution) are a thing in Italy