He was also a prolific session musician and worked with the Who on the film soundtrack of Tommy, Joe Cocker, Traffic, George Harrison, Jerry Lee Lewis, Peter Frampton, the Bee Gees's Maurice Gibb, Gary Wright, Johnny Thunders, Luther Grosvenor, Neil Innes, Steve Gibbons, Chris Jagger, Nanette Workman, Sean Tyla, Jim Capaldi, Pat Travers and Andy Fraser.

On the basis of this work, he was invited by Brian "Monk" Ffinch to play with Wayne and the Beachcombers in Birmingham, which started his career as a professional musician.

[3] After the initial decline of Spooky Tooth, Kellie joined Johnny Hallyday's band for a summer tour of France in 1974, before forming The Only Ones in 1976 with Peter Perrett, Alan Mair and John Perry.

[citation needed] In February 1978, Johnny Thunders moved to London with his family, and began playing with a loose revue dubbed the Living Dead.

[5] Kellie became part of this floating line-up (that also included Perrett along with Sex Pistols Steve Jones and Paul Cook) and recorded Thunders' So Alone album together with his signature song "You Can't Put Your Arms Around a Memory".

Entitled Music from The Hidden, the album was produced by Kellie who also played drums, organ, bass and acoustic guitars, percussion and sang lead vocals.