Whilst at art college, he would experience the beginning of his first of many persona portrayals:[1] I remember once dressing up as a rocker in leather gear, greasy hair and boots and storming into the Principal's office pretending to be my brother.

The Bonzo Dog Doo-Dah Band appeared in the Beatles' 1967 TV film Magical Mystery Tour and also in the ground-breaking ITV television series Do Not Adjust Your Set, which featured future Monty Python members Eric Idle, Terry Jones and Michael Palin.

On 28 January 2006, with other surviving members of the Bonzo Dog Doo-Dah Band, Smith played a reunion concert at the London Astoria.

A countrywide tour, which began in Ipswich and ended with two shows at the Shepherd's Bush Empire with Adrian Edmondson and Phill Jupitus, followed during November 2006.

Under the pseudonym 'Topo D. Bill', a one-off musical collective that included Keith Moon of The Who, Chris Squire and Tony Kaye from Yes and fellow Bonzo Roger Ruskin Spear, Smith released a non-comedic cover version of Jim Pepper's song 'Witchi Tai To' as a single on the Charisma label.

Harrison wrote and recorded a song about Smith called "His Name Is Legs (Ladies and Gentlemen)", released on his album Extra Texture (Read All About It) (1975).