He returned to Adelaide, Australia, to join a newly formed rock band Quartet which, despite a contract from England's Decca Records, proved unsuccessful.
For a time, following their move to London, he and his fellow Adelaide bandmates—guitarist Terry Britten, bassist Alan Tarney, and drummer Trevor Spencer—made their livings as session musicians together, playing with everyone from the New Seekers and Mary Hopkin (Earth Song/Ocean Song) to Cliff Richard, whose regular backing band they became on stage and on record during the 1970s.
Peek also worked with Manfred Mann, Lulu, Tom Jones, Jeff Wayne (War of the Worlds) which he contributed to as part of the orchestra, and Shirley Bassey, among others.
In association with classical guitarist John Williams, keyboardist Francis Monkman, bassist Herbie Flowers, and drummer Tristan Fry, Peek played on seven studio albums with the band, before departing in 1991.
Peek was jailed for three years in 1994 for 28 counts of fraud over a scheme in which he admitted faking information provided to factoring financier Scottish Pacific.