Muscle Records was a DIY label. It managed one single by Hamilton, 'Jet Set Girl' b/w 'Methodone And Coconuts'. It had a catalogue number of MUS-1, and was issued in 1979.  Its matrix number, SJP-806, was one of a series used by Clubland Records, of Hayes, which was responsible for making the single. Distributed By Muscle Records. Thanks to Robert Lyons For The Info.

79 Hamilton Jet Set Girl MUSCLE SJP 806 - MUS 001