When my father was a student at the University of Cape Town in the 1970s, the university went to court to prevent the police coming onto campus during political demonstrations. Yesterday Michael Chessum, the president of the University of London students’ union, was arrested on suspicion of an offence under Section 11 of the Public Order Act – failing to notify the police of a public procession. The procession in question was a demonstration the previous day of maybe 200 students, on the pavement outside the students union, around the perimeter of Senate House and in the Senate House car park.