UK, Ireland / Poles working in Manchester, England - request for facts [34]

Hello... I need some facts here not just opinions:) can anyone help me with some acurate facts. Im English my only connection with poland is I once had a family member, a very close friend to me who was Polish. He married into my family and moved to England worked incredibly hard to bring up a young family. I visited his home town in Poland, Morogovo? (sorry I forget how to spell it) Was given a wonderful welcome and I also spent some time in Wasaw which was also very interesting. Since that time obviously I have noticed a huge influx of polish people into Manchester working in many retail and service jobs. Every Polish person who has served me has always been very polite and generally professional.

However I constantly hear many English people saying "Poles have all the Jobs!!" and there is an obvious and growing resentment which Im sure is based on ignorance and fear, but, so I can be well informed with acurate facts to respond to this racism... can anyone explain to me why so many retail and hotel companies do indeed seem to employ so many eastern Europeans to the point where I am surprised when an English person serves me?

Is it? ...simply that young polish people have a better work ethic and interview for all these jobs well?... or is there some form of employment contract that companies have to provide jobs direct to Polish people who want to work in England?

Please can you enlighten me ..but I need calm facts not heated responses:))??