Student visa system fraud exposed in BBC investigation
10 February 2014 Last updated at 10:35 GMT
The Home Office has suspended English language tests run by a major firm after BBC Panorama uncovered systematic fraud in the student visa system.
Secret filming of government-approved English exams needed for a visa showed entire rooms of candidates having the tests faked for them.
The English Testing Service - one of the largest language testing firms in the world - said it did all it could to prevent fraud.
Richard Watson reports.
Panorama: Immigration Undercover - The Student Visa Scandal will be broadcast on BBC One at 8.30pm on 10 February