Remember the show very well - Lancaster was in fact Jack Lancaster (ex Blodwyn Pig) but as for the other support, as far as I remember it was a solo artiste who was called Jonathon Swift who I think was from Bradford. (Remember him because his album featured a naked woman in a lake - long shot of her I'm afraid!) I distinctly remember him as he went down a storm and during Yes's encore (America) he was invited on stage to huge applause and enthusiastically banged a tambourine.
Can't say Lancaster moved me at all but "Swifty" was excellent and obviously so were Yes. A good night, all in all.