There's an awfully strong connection between the danger then and the danger now.
https://www.thejc.com/comment/leaders/to-all-our-fellow-british-citizens-1.491812
In 70 years the British Nazis have tried dressing in Nazi gear, as skinheads, as 'nationalists', and many other disguises, but none of those ever fooled British voters. Sadly they've now discovered that wearing a red rosette works, at least on hard-core Labour supporters. We can only pray they can't fool enough others in this election.