The UK government plans to pressure universities to eliminate student union "no platform" policies that exclude speakers on account of their views.

There is an anomaly here which I hope someone can explain to me. Can a student union bar a speaker from speaking at the university, or only from speaking in the student union's own events? When I read the actual text of the no-platform policy, it seemed to say the latter.

How does that endanger the diversity of views at the university? Does the student union have a monopoly on hosting outside speakers?

Meanwhile, what about university censorship that has nothing to do with the student union? For instance, will universities be fined for censoring a speech at the request of the Israeli embassy or excluding speakers on request from spy agencies?