Re: yay, statistics
"However, not only are they able to support themselves in UK, they make enough to send back home and support the family. "
Yes, usually by living in absolute shitholes and/or sharing accomodation in numbers which are well above what are recommended for multiple occupation dwellings.
You can put up with that kind of thing for a while, but it leads to illness, stress issues, etc and means there's a high turnover of people to/from Poland as they burn out and are replaced by more cannon fodder. This phenomenon isn't just limited to Poles.