Problem is they are comparing those workers with the steroetypical east euopeans.
The contract was put out to tender and the italian company gave the best price, their blokes will be on good money and will be highly skilled men.
Unfortunately, any big job in the uk can become unionised and this leads to blackmail of the client/employer.
I was on a big uk job years ago, getting paid 120 hrs a week for working 40 hrs, constantly being monitored by shop stewards to make sure you did a bit more than sfa. E.G. only connect and fix 10 wall fittings per day.
For me great while it lasted, but it means uk contractors have to build that nonsense into their price. Hence they price themselves out of the market and the foreign contractors move in.