In 1969 he founded the well-regarded and influential group The Trio along with two expatriate American musicians, bassist Barre Phillips and drummer Stu Martin. In the mid-1970s he founded one of the earliest all-saxophone jazz groups, S.O.S., along with alto saxophonist Mike Osborne and tenor saxophonist Alan Skidmore. During this early period he also recorded with (among others) saxophonist Ronnie Scott, guitarist John McLaughlin, bandleader Michael Gibbs, trombonist Albert Mangelsdorff, and pianist Chris McGregor's Brotherhood of Breath.