John Butcher is a saxophinist born in Brighton in 1954 and now living and playing in London. A Wikipedia snippet:
He has taken the concern with the manipulation of multiphonics (split tones and false notes) bequeathed by earlier improvisers such as Evan Parker in new directions: though his earlier albums could be busy at times, he has come increasingly to focus on creating rich, slowly-changing strata of sounds.
Official website HERE