Confidence in the two new financial services regulators will be at risk unless more is done to attract and retain staff, the public spending watchdog has warned.

Up to 50,000 migrants may have used flaws in the student visa system to come to the UK for work in its first year, the country's public spending watchdog said today.

Up to 181,000 migrants who should have gone home over the past two years alone could still be in the UK illegally, figures showed today.