Musicians:
Robert Calvert - vocals [Hawkwind, Hawklord, Amon Duul, Nektar]
Arthur Brown - vocals on "The Song of the Gremlin" parts 1 and 2
Paul Rudolph - lead and rhythm guitar (all), bass guitar on "The Song of the Gremlin" parts 1 and 2, "Hero with a Wing" [Pink Fairies, Hawkwind]
Dave Brock - lead guitar on "The Widow Maker" [Hawkwind, Hawklord]
Lemmy Kilminster - bass guitar [Hawkwind, Motorhead]
Nik Turner - saxophone [Hawkwind]
Brian Peter George St John La Baptiste De La Salle (Brian Eno) - Synthesizer
Del Dettmar - synthesizer [Hawkwind]
Adrian Wagner - keyboards on "The Song of the Gremlin" parts 1 and 2
Simon King - drums [Hawkwind]
Twink Alder - Funeral drum on "Catch a Falling Starfighter" [Pink Fairies]
The Ladbroke Grove Hermaphroditic Voice Ensemble - back up vocals
Actors:
Vivian Stanshall - most leads (e.g. Ground Control, Bright Mechanic)
Jim Capaldi - American Salesman, Recruiting Officer, Dim Mechanic [traffic]
Robert Calvert - Pilot
Tom Mittledorf
Richard Ealing
Sounding good so far - I know he loved his planes, but he was obviously also a Flying Circus fan too!