I've spoken to so many lads of my age over the years who remember watching this the night it went out on the Old Grey Whistle Test; like a rite of passage. Led Zeppelin, unsurprisingly, weren't available. And as no oven ready promo film of them playing Trampled Underfoot existed, it was left to the boffins at the BBC to come up with something. Anything. They didn't disappoint.
Led Zeppelin - Trampled Underfoot (1975)