This is the little-seen promo video for Brian Eno’s song China, My China (from 1974’s Taking Tiger Mountain [By Strategy]).
Eno appears with Polly Eltes and Judy Nylon.
Judy Nylon is the American-born performer, writer and artist who took 70s London by storm.
Nylon was often in cahoots with her partner in Snatch, Patti Palladin. Here they are performing at Hurrah! in 1979. I think this was shot by the estimable Paul Tickell: