Duff was involved with 16 world champions and many leading British fighters , including Frank Bruno , Joe Calzaghe , John Conteh , Terry Downes , Lloyd Honeyghan , Maurice Hope , Charlie Magri , Alan Minter , John H Stracey , Jim Watt and Howard Winstone .
He promoted and managed many British boxers , including Frank Bruno , Joe Calzaghe , John Conteh , Terry Downes , Lloyd Honeyghan , Maurice Hope , Charlie Magri , Alan Minter , John H. Stracey , Jim Watt and Howard Winstone .