I first encountered him in the terrific Pentangle band in the late 1960s but before that he'd:
Backed Roy Orbison on a UK tour
Played on the theme tune of Thunderbirds TV programme

Played on albums by Marianne Faithful & Incredible String Band + played with jazz musicians at Ronnie Scotts.
Since Pentangle, featured on albums/stages with notables such as Nick Drake, Davey Graham, Michael Chapman, Richard Thompson (all excellent guitarists)
Collaborated for some years with John Martyn
Played on the very popular Cliff Richard's "Congratulations" track

RIP to a very fine & versatile British (musician's) musician