Heading the Open University, a British institution venerated on a par with the NHS, would be a huge responsibility, Tim Blackman, its new vice-chancellor, was warned by fellow university leaders. But, they said, “we all believe in the OU”. There have been times in the past few years when this veneration has been tested. The government’s decision in 2012 to raise tuition fees and cut grants delivered a shock to the OU’s business model, which relied on mature and part-time…