Opal Butterfly Were An English Late 1960s Band From London. The Band Featured Simon King Drums And For A Short Time Lemmy Who Met Again In Hawkwind. Further Members Were Robert C. "Robbie" Milne Guitar Allan Love Vocals Richard Bardey Bass And Tommy Doherty Guitar . They Released Only Three Singles Between 1968 And 1969 . They Appeared In The Film "Groupie Girl" 1970 By Derek Ford As "Sweaty Betty "