During the 1960s he was featured as pianist, arranger and composer on BBC programmes such as Music in the Air, Melody around the World and Ronnie Barker's Lines From My Grandfather's Forehead.
Among his pupils was Gordon Langford, whose surname was originally Colman (and who changed the name on Demuth's advice).
Gordon Brown | Flash Gordon | Gordon Lightfoot | Dexter Gordon | Gordon Banks | Charles George Gordon | Mike Gordon | Gordon Highlanders | Gordon | Kim Gordon | Jon Langford | Gordon Ramsay | Lonnie Gordon | Jeff Gordon | Gordon B. Hinckley | Douglas Gordon | Cam Gordon | J. Gordon Melton | Gordon Strachan | Gordon Pinsent | Flash Gordon (serial) | Herschell Gordon Lewis | Gordon Smith | Gordon Raphael | Gordon Cooper | Gordon Castle | Gordon Bell | Gordon Beck | George Hamilton-Gordon, 4th Earl of Aberdeen | Edward Gordon Craig |