This one is tricky. Sitting on the wall I believe is Paul Jenner. I recognise the characteristic stoop (sorry, Paul - I know you are listed on this site...). Sitting in front of him, isn't that Mike Winkworth? To Paul's left, the shape of the head indicates John Moore. Centre left looks like Mick Gillham. ?Geoff Milton foreground left? And the bottom on the extreme left surely belongs to...