Racking my brains, I think it was the late Mo Foster on bass guitar at the Scott's appearance. I recall that he was often called up by Evans, along with Ray Russell, for these late era European gigs.
I suspect Gil might have been working on/recording 'Absolute Beginners' around that time.
The other thing I remember about seeing Evans is the kaftan and bandana. Anything but the suited guy on those Impulse sleeves !