THOUSANDS of young Pakistanis exploited a hole in Britain’s immigration defences to enrol as students at a network of sham colleges, The Times can reveal.

The gateway, opened by fraudsters who have earned millions from the scam, has allowed in hundreds of men from a region of Pakistan that is the militant heartland of al-Qa’ida and the Pakistani Taliban.

Eight of the terror suspects arrested last month in Manchester and Liverpool, in north-west England, were on the books of one college. It had three small classrooms and three teachers for the 1,797 students on its books. Another college claimed to have 150 students but secretly enrolled 1,178 and offered places to a further 1,575 overseas applicants, 906 of them in Pakistan.