Why do people want to hire Polish people or other Eastern European people over natural born U.K. people to do manual labor?

since when this started? and is it similar to the Hispanic people taking manual labor jobs from white Americans? how so and why?
Update: ok, but have you ever thought about WHY they are willing to work for less and harder? it is something to do with the fact that in their country they get paid 5 x or more less? is that FAIR really? boy they have gone much further than Thathcher's breaking up the unions haven't they? Roman empire ?
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