An examination of the emerging London underground psychedelic movement that pre-dates San Francisco's "Summer of Love" by six months. Several segments feature Paul McCartney talking about the underground scene, what it means, and why the older generation shouldn't fear it. John "Hoppy" Hopkins, well-known figure from Swinging London's underground, leads a "Pot is Fun" happening in Piccadilly Circus. Poetry readings at the Royal Albert Hall by poets Allen Ginsberg, Adrian Mitchell, Lawrence Ferlinghetti, Gregory Corso and others.
—Ulf Kjell Gür