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With the Government cracking down on migrants working illegally, Simon Cox investigates Britain\'s shadow economy. He meets illegal workers to ask whether the get-tough message is putting them off. And he reveals the ways in which both employers and workers are getting round the law. So can the UK Border Force deliver on ministers\' promises to make the UK an "unattractive" place for those who want to work illegally?

Reporter: Simon Cox Producer: David Lewis.