I have nothing against Polish people, but company bosses who do that are greedy traitors. Its quite similar to companys like Norwich union taking jobs off British people and giving them to Calcutta.
I believe this practise should be antisocial and hopefully people like this boss you speak of, have no mates. All humans are equal of course, but as a British person, i believe we should put British people first.
When you see your boss, tell him i said he is a fwkin wnker :D