Mass amounts of cheap, imported, ready trained labour who have been trained to lower standards than in Britain & throw in communications issues wrt language barriers.
Seriously Charmageddon?
Do you have any idea who built Britain? The canals, the railways, the Underground, the motorways, the massive engineering projects that gave the cities sewers?
The answer is untrained, cheap, foreign labour, from Ireland.
I'm afraid I have no stats, facts or studies to link to, just anecdata unfortunately
No kidding.
Or maybe you are one of those people who have not yet heard that Ireland is a separate country.
The Irish also built American cities and infrastructure, including cities that are marvels of engineering like Chicago, where a river's course was reversed and tunneling miles under Lake Michigan to secure a clean water supply was required.
Look around and watch it all collapse.
Look out also for problems on a massive scale in the US stemming from the employment of Poles and Mexicans in industries like roofing, home renovation, infrastructure projects, etc. in recent years.
Don't hold your breath.
(And YYY to home renovation including much more than slapping some concrete blocks together).
I'm not talking about individual tradesmen or you & your pals hiring a small team to refit your bathroom.
I'm talking about the big contracts - where they are subcontracted & subcontracted & subcontracted and overall control is diluted to the point that standards inevitably slip & corners are cut.
FYI:
www.murphygroup.co.uk/
Does this look like bathroom renovation to you?
Where do you imagine this company got its name?
And who do you imagine they employ?
This is the company where a cousin of mine, an engineer, got his first job after graduating with B.Eng from University College Dublin.
Maybe you are one of those people not yet aware that foreigners can be engineers or foremen? I suspect from your comment on language difficulties that you believe the white collar elements of a big infrastructure project must be British or limited to English as their mode of communication.
Here's an example of a high rise fire that caused no fatalities, and the piece suggests why.
Note that this is a building constructed by foreign cheap labour, from the Phillipines and South Asia and Africa.
www.bbc.com/news/uk-england-london-40273714
In Dubai, recent high-rise building fires, including at the 79-storey Torch Skyscraper in 2015, spread because of cladding, according to fire engineering consultancy Tenable Dubai.
But these fires caused no fatalities because the design and construction of the buildings allowed firefighters to battle the blaze and residents to evacuate via smoke-free, fire-free safety zones, it says.
"All the fires here lasted for six or seven hours but occupants managed to evacuate successfully and all fires were extinguished with no loss of life," says Sam Alcock, [Tenable's] director.
"In my opinion, design and construction is what saved lives."
Residents in Grenfell Tower had previously been advised to stay inside their flats in the event of a fire, and Ikhwan Razali, a fire engineer with Tenable understands why.
"You can advise people to stay in place if you have good fire suppression between levels, but in this case [in London] the advice appears to be wrong."
The cause of the fatalities in the Grenfell fire is very clear.
It is also very clear that cheap, whatever, foreign labour has absolutely nothing to do with the tragic outcome.
If you are not anti foreigner then do not impugn the technical skills or the training or the language skills of the labourers. This was not a case of every factor including cheap foreign labour lining up to make a perfect storm, a disaster waiting to happen. This was a case of regulators and administrative bodies utterly failing to do their jobs, aligned with greed on the part of the construction company, inspired by the idea that 'greed is good'.