Around 6% of public tip-offs about illegal immigration lead to an investigation and only 1.5% results in a person being removed from the country, according to a Home Affairs Select Committee report.
The report also said the now-defunct UK Border Agency (UKBA) had a backlog of 432,029 immigration and asylum cases when it was scrapped at the end of March, which at current levels will take five years to clear.
More top news
The privatisation of Royal Mail was handled with "considerable professionalism" , says a report from Labour's former City Minister
Public libraries face "absolute disaster" and should take inspiration from coffee shops to avoid large-scale closures, a report has claimed.
Around 40% expressed concerns over the effect their job had on their health, a survey has revealed.