Exit checks data raises questions over May's focus on student overstayers

Cracking down on ‘bogus colleges’ made for good headlines but limitations of migration estimates have been well known for years“Students, yes; overstayers, no.” That was the blunt message from Theresa May, then home secretary, to Conservative party members at their conference two years ago.“Let me be clear about students – we welcome students coming to study,” she said. “But the fact is, too many of them are not returning home as soon as their visa