A cultural counter-revolution is under way in Hungary. And one of its nerve centres is an unassuming apartment on the west side of Budapest, where youthful keyboard crusaders rattle out lurid tales of migrant miscreants and liberal lunatics, apparently straining at the fenced-off borders for an opportunity to destroy the country.

Two snappily dressed young men peer suspiciously from the doorway. ‘How did you find us?’ asks one. ‘Who gave you our address?’