In a large marquee within the grounds of Goldsmiths, University of London, this year’s freshers’ fair is in full swing. Amid a good-natured hubbub, each student society sets out its stall and attempts to sign up new arrivals. There’s an anti-racist action group, an Amnesty International Society, a Wildlife and Eco Haven Society and something called Diversity on the Decks – “a womxn, non-binary and LGBTQI+-centred DJ collective”.

There’s a banner advertising Extinction Rebellion, the climate change activist group, and another demanding in big red letters that education be “decolonised”. There’s a Marxist Society and a Labour Society. But there is, notably, no student Conservative Society.

“Do you know any Right-wing students?” I ask a Labour Society committee member. “Yeah, there are some – unfortunately,” he smiles, perhaps only half-joking.

But no one can remember exactly when the university’s Conservative Society disappeared. In the country at large, the so-called Overton window – the range of political ideas deemed acceptable by the public – has expanded in both directions. Those with either extremely Right-wing or extremely Left-wing opinions have found in social media a new forum in which to express them and find fellow travellers.