JeffA:
But be fair orys. British workers didn’t get better pay and conditions than polish workers by a divine gift of God. They got it because they spent two hundred years fighting and dying for every last single right they managed to wrestle from the employers.
Oh, no, history again 
So:
Also they were able to gain this, becouse Britain was a rich country. And why Britain was a rich country? Becouse it was benefiting from it’s colonies etc.
Is it really fair that millions of polish people who havn’t fought for any rights can now come over and take advantage of 200 years of industrial action?
If the British Politicians, who were elected by voices of British Workers invited them to come and take advantage, I can’t see nothing wrong with it. Again: it wasn’t colonialism, we don’t came here with a sword and fire and forced you to give us your rights. It was you who invited us. You gave us also ALMOST the same rights you have. Thanks for that, it was really nice of you.
I think being born in the country does grant you certain rights above and beyond a foreigner.
Off course. You have many certain rights here, you can vote, you can claim benefits whenever you want (don’t need to wait two years until you will be able to ask for some of them), you can travel to some countries without visas, you don’t need to register with Workers Registration Scheme - there is plenty of them. We are still “second category citizens” and I am fully OK with that. Edited: we are not citizens, we are only residents
I’m happy that iraqis for example get all the money from Iraqi oil - because it’s their country.
Do you really believe, that Iraqis are taking all money for their oil? 
Similarly british workers should get the advantage of decent pay and working conditions that their forefathers fought for.
You have decent pay and working conditions. Polish workers working here at exactly the same rules you are. It’s illegal for us as well to work under minimum wage etc.
Times are hard and you would have a propblems even without any foreigners in your country due to financial crisis. Who would you blame for then?
Why don’t Polish workers fight for decent pay in their own country?
History again 
They fought, I dare to tell that even harder then british if you check how many members of trade unions was shoot in Poland and UK in last, say, 60 years.
Problem was that we had to start from much harder position as the Three Big Countries decided that they prefere their own people’s peace of mind than to fulfill promises given to Poles who were supporting them during the war. And there was three main players: Stalin, who is out of question as a mass criminal, US president, who have no interest in Poles, as they weren’t helping US for obvious reasons, and Churchill, who owed a lot to Polish army and inteligence and was also bounded by agreement about mutual protection. We fullfiled our part, many of Polish soldiers died for Britain. And they we were left to Stalin after war. Somehow they managed to keep Greece under Western influence, and what Greece did for UK during the war?
So, simply, we had to start from much harder position, as we had to rid off the comunism first. Than we started economical reforms in 1989 and yet 20 years later workers in Poland have the same level of rights like British workers have (as we are members of the same EC with the same European law). Only problem is Economy, for obvious result we can’t develom the same economical level and catch up the West after 60 years of Soviet exploitation of our country.
Off course European Union is based on Economy, not on history and reasons why there is a common market of workers is stricly economical not based on historical issues. But you asked why we are where we are, so I answered to you.
Btw: Nowadays you can see how good is to be part of bigger economical system: you can see that on example of Britain (who was very hard hitted by credit crunch due to it’s own currency and economical ties with America. Countries who are in Euro zone are having hard times as well, but they are dealing with that more smoothly, as Euro is stronger that a pound. On the other hand you have Poland with it’s zÅ‚oty, which is a target for speculation which recently bringed Iceland to bankruptcy (luckily we are not so small country and our economy is quite well, yet ZÅ‚oty is now weak like over two years ago).