[4] During the 1970s, his jazz-rock group Major Surgery played a regular weekly gig at a Croydon pub, the Dog & Bull.
Weller played saxophone on the 1973 album Allright on the Night by British hard rock band Tucky Buzzard.
He also played on the Alex Harvey album The Mafia Stole My Guitar released in 1979 delivering the solo on the track Wait For Me Mama and writing Don's Delight.
In 1981, he stood in for Michael Brecker when the Gil Evans Orchestra played at the Bracknell Jazz Festival, subsequently touring the UK and recording with one of the band's trumpeters, Hannibal Marvin Peterson, added on to the Weller–Spring Quartet.
His account of "We'll Be Together Again" at fellow musician Bobby Wellins' funeral in late 2016 was, in saxophonist Art Themen’s words, “incredibly moving and eerily prescient”.