I believe the government has now done so with Bulgaria to stop the same thing happening.
Basically because the Poles are thought of a very patriotic bunch they did not think they would migrate here in such numbers. I live in Ashford Kent and I can tell you they are far and away now the largest group of immigrants in this area far outweighing the Kosovans and other Islamic people.
I agree though the people we are afraid of it is the Islamics but numbers wise Poles and slovaks/checs are out numbering them.
Odd thing was I sat next to Portuguese flying into and out of London. They both talked about the enormous problems Portugal is having with a huge influx of Eastern European and African immigrants. One was a school teacher and she said her school has students that speak 27 different languages! All that money wasted on the Kennedy family! I think I could be very happy just traveling around the world the rest of my life.