"The known presence of an estimated 725,000 irregular migrants in the UK presents politicians and civil society with a challenge which is currently not being met. But the work of independent researchers can tell us much about how irregular migrants arrive, what they do, and the critical issues which their presence introduces … This report identifies some of the key questions that are being asked about irregular migrants, and uses research to provide answers where they are known, and an honest response where they are not." (Quoted from paper)