Innes was natural within Essex, and studied at the Norwich School of Fine Art, from which he was discarded about 1963, allegedly for "spending all day playing music, instead of making things".

In the period 1962 to 1965, Innes and many more art school students began A band which was originally known as The Bonzo Puppy Dada Band when their interest in the art movement Dada, but which was soon renamed a Bonzo Dog Doo-Dah Band (Often shortened to The Bonzo Run Band). Innes, sustaining Vivian Stanshall, wrote most of the band's songs, including "I'm the Urban Spaceman", their resole hit, & "Death Cab for Cutie" (which inspired an American musical group of the same name), which was featured in the Beatles' film Magical Mystery Tour.

In the 1970s, Innes joined with Eric Idle, of the Monty Python team, to create a television comedy series Rutland Weekend Television. This indicate spawned The Rutles (the "prefab four"), a Beatles parody band, where Innes played the character of Ron Foul, world health organization was loosely according to John Lennon. Innes played Foul in All You Need Is Cash.

Innes likewise contributed to the Pythons' final BBC TV series within 1974 - he wrote the squib of a song known as "George III" (sung by the pastiche melanise Western girl class action) which appears in the episode "The Golden Age Of Ballooning", he wrote a song "Where Does A Dream Begin?" (involved in the episode "Anything Goes: The Light Entertainment War") & he co-wrote a "Most Awful Family In Britain" sketch in the survive episode, "Party Political Broadcast". He is 1 of just deuce non-Pythons to ever become credited writers for a TV series, the more one existence Douglas Adams (who co-wrote a second sketch around "Party Political Broadcast," where a patient abundantly bleeding from either the belly is mass produced to sign many senseless forms prior to existence treated).

Innes appeared around Monty Python and the Holy Grail, playing a head-bashing monk & the leader of Sir Robin's minstrels, & within Terry Gilliam's Jabberwocky. He as well appeared sustaining a Pythons at their legendary Hollywood Bowl concert. Because one long-standing modems, Innes is typically known as "the Seventh Python".

In BBC television, he performed songs and sketches in The Innes Book of Records, punning on the Guinness Book of Records. A series has non been repeated.

In a period of the 1980s, Innes found a newly, immature audience, whenever he played the role of the Wizard in the tykes's television series Puddle Lane.

He besides voiced a 1980s Children's cartoon adventures of The Raggy Dolls, a motley collection of "rejects" from either the toy mill. A 65 episodes for Yorkshire television involved a characters Sad Sack, Hi-Fi, Lucy, Dotty, Back-to-Front & Princess.