This one is for fun. They are announced as Yes. Yet the performance is all about Dave Cousins of the Strawbs. I suspect there was a collaboration between the Strawbs and Yes to confuse the Top Of The Pops people here in the UK.
Hope there are people out there who can help with the info. I certainly suspect we have 1 poster from Brazil who knows MORE about Dave Cousins than I do so this is also a Christmas gift to her.
Oh yes... look out for Rick Wakeman running a PAINT Roller across his keyboard :o)