If it was growth and employment alone, they woudl have to explain why native people go to work in other countries.
Apart from my relatives, I've only met three people from major Polish cities: a nurse from Poznan (great bloke), and my ex-girlfriend and her son - both from Bydgoszcz (allegedly - I suspect "wiocha" myself, lol).
Of the remainder, none came from Warsaw or the major cities, but small towns/villages I'd mostly never heard of. That tells you a lot about the kind of people who move from Poland to the UK. Most of the educated big-city Poles can find work back home, even if they have to move to Warsaw to do it lol. Just like over here, really - if you want to "make it", you probably have to move to London.
I keep telling you this place kicks arse!
I've been saying it for years. Americans may knock it, but it's a city full of potential. Those who know, know. Those who don't know... get to know ;)