More than 90 percent of British universities have been involved in restricting free speech on campus this year, a new survey claims.

In the last year alone, 21 universities have banned high profile speakers from attending lectures, debates or speeches because of their views, including Oxford, King’s College London and University College London.

According to the survey, carried out by online magazine Spiked, more than 60 per cent of universities now “severely restrict” free speech, meaning they actively censor particular ideas, speakers and texts on campus.

No-platforming, whereby student unions or universities formally ban an individual from speaking on campus, has become become increasingly commonplace - with the likes of Germaine Greer, Eric Pickles and several UKIP MEPs among those blacklisted.