By day they were Victorian gentlemen with sedentary lifestyles and smart boots. By night they were rabid radicals, roaming the streets with revolutionary fervour.

They were Karl Marx & Friedrich Engels and they changed the world.

We follow in their footsteps across the city: to the Royal Exchange where young Friedrich posed as a capitalist; Engels’s office on Southgate where his work at the coal-face of capitalism gave Marx so many tips; Police Street (sic) where Engels had a secret mailing address; Chetham’s where the two researched; the slums around the River Irk and “Irish Town”.

This enthralling and exhilarating walk is led by Ed Glinert who once joined a Trotskyite group so secret its members were obliged to communicate using only pseudonyms. He now votes capitalist.