We have a similar problem, in that before the Olympic site was developed before 2012 the mayor of Newham Robin Wales (who happens to be a Scotsman) said there would be jobs for local residents.
Could I get a job there? No, but there were hundreds of Eastern Europeans, Asians and Africans (many illegals, some with 'fishy' passports who were ejected fom various job agencies) who subsequently proved unsuitable for the security jobs they were given. The situation turned bad enough for the security firm responsible to be found wanting and the armed forces had to put staff in. several of the G4 Security managers were arrested for illegal status and other offences.
It cost the Olympic organisers a lot more cash than they bargained for, and the building contractors had hiring problems of their own.
Serves them right. As it is, the whole shebang went off fairly well and nobody noticed the 'cracks'.
We have a lot of migrant gangs working in agriculture in the eastern counties, but the farmers who employ them pay silly wages, which is why no British workers will touch the jobs. They have their own problems, and then here are the Philipino and other hotel workers who also work fo peanuts. Asian workers in general work for their own kind, usually as 'halal' butchers and usually also illegal. Their employers have to pay a £5,000 fine per head when found out. (About $3,500?)