Here's an article from the Grauniad complaining about goby policies to limit immigrants access to benefits and citizenship. The question the writer poses is: Who will do the lobs the immigrants did when they've gone?
Answer: Our own unemployed. There's a lovely Polish lady working in the chipshop round the corner. If she should return to Poland, will there be any British unemployed person available with the skills to serve fish&chips? Of course there are, millions of them. But, if they took the job, they'd lose benefits almost £ for £, so being rational people, they don't take these jobs, leaving them free for immigrants who don't get the benefits.
So the key to the crisis of mass unemployment and jobs that are only done by immigrants is to change the benefit system, since it's design is the root cause of the problem. No Guardian writer could bring himself to write that, though.