Aymeric Leroy from France has written in to help with the unidentified people in the Gong picture below. He says:

“the first person on the left seems to be Francis Linon (aka Venux de Luxe), Gong’s live sound engineer at the time – and these days (for over 30 years now), with Magma. The other guy would seem to be Tim Blake (keyboards), but his face is partially hidden”. Many thanks, Aymeric!