Their debut TV appearance on a show called 'So It Goes' (along with the Sex Pistols) resulted in a liaison with Paul Burgess who soon after, recommended him to 10CC which he joined towards the end of 1976 at the launch of the Deceptive Bends album and has been part of the team ever since.

As a guitarist, he has recorded with numerous artists among them Cliff Richard, Peter Green, Agnetha Fältskog (ABBA), Marilyn, Sniff 'n' the Tears, John Wetton, and Justin Hayward.

From the late 1980s, Fenn devoted more of his time to composing and wrote countless scores for television documentaries, dramas and comedies (including series for Hale and Pace and Craig Charles) and a number of feature films.

[citation needed] He went on to form a writing partnership with Howarth, now the lead singer with the Hollies, and in 1990 they wrote a rock opera called "Robin, Prince of Sherwood" which toured the UK for a year and spent four months in the West End.

[4] When not working with 10CC, Fenn now spends most of his time at his home near Byron Bay, New South Wales, in Australia, where he has also collaborated with Australian rock legend Brian Cadd on various projects including a stage musical.