Thousands of A-level students could have their unconditional university offers withdrawn this summer, as ministers and the higher education regulator try to crack down on panic offers made during the pandemic. Sources at Westminster say the universities minister, Michelle Donelan, is determined to constrain universities, after private government data showed that 30,000 offers that had been dependent on A-level grades were suddenly switched to “unconditional” when the pandemic struck in March. The competition to recruit UK students will be more…