An infernal ear worm is lodged in my head. That tiresome chant “Ooh, Jeremy Corbyn” heard at Glastonbury to the tune of the White Stripes’ Seven Nation Army has been stuck there since last Saturday when I wandered into London in time to be swallowed up by “anti-austerity” marchers on route to Trafalgar Square.

What a bunch they were. I could just about empathise with the youngsters blowing their whistles, banging their drums and shouting “Tories Out!” since as a student I joined similar demonstrations. In those days, mind you, our anger was directed against the Labour government because it represented “The System” to which we were opposed for reasons that seemed obvious at the time but which have become hazier with age, tax and family responsibility.