1) there is no system in this country regardinng benefits or housing that favours immigrants
2) people coming in from established EU countries aren't immigrants, because the EU is a single economic block. You are as entitled to go to spain or france to work, where you won't be classed as an immigrant either.
3) people coming from new accession EU countries have to live here for 3 years before being entitled to benefits, housing, or other perks like a cap on fees at universities
4) people working for less than minimum wage and undercutting local rates of pay are doing so illegally, whether immigrants or not. its their bosses who are cheating the system, and the traditional view would be that those workers themselves are being massvely and illegally exploited
5) people coming from outside the EU are not entitled to anything.
6) asylum seekers aren't entitled to anything and aren't allowed to work, either. The state does house and feed them at subsistence level while examining their cases. if they are granted asylum they are allowed to stay and join the benefit queue like everyone else. if not, they have to leave, and will be deported with complulsion if they don't leave voluntarily
7) asylum seekers who can be shown to have come to the UK from another safe country where they could have claimed asylum will be removed to that country of passage.

we were all happy to ride the economic boom on the back of cheap polish labour. Now the economy is gone to pot and jobs are on the line, it's a simple option to blame immigration. in practice it's nothing to do with immigration. we live in a globl economy, and those workers would more like be undercutting our jobs if they DIDN'T work within our system, but instead were able to work in lower-paid, less regulased, less safe environments back home.
9) its also the case that labour follows prosperity, and we've benefitted just as much as we've lost out. My mate's dad used to be an oil worker in Lybia, ffs. And does nobody remember Auf Wiedersehen, Pet?
10) Great Britain is an immigrant island. always has been. I hope it always will be
11) mutt you almost certainly wouldn't be allowed to settle in the USA or Australia. if you think you have something positive to offer society, it's clearly their loss. but if overseas workers have something to offer our society, then preventing their coming here is our loss.
12) last, a lighthearted note.. an old PM of New Zealand once said he was happy for any kiwis who wanted to move to Australia to do so, as it would increase the average IQ of both countries.