I saw this on New Year's Day 1994. My memories are mostly of the bizarre design, and the two things that immediately come to mind are the dandies that descended from the flies on swings dressed like people in Magritte paintings during the Ascot sequence and the giant glowing head in Higgins's laboratory. The latter derailed any possibility of becoming absorbed in any scene set there; it was so overwhelming and ugly.
I remember Errico's singing being wonderful, but her accent being suspect. Chamberlain was suave and did his best trying to play scenes next to a giant plaster cranium.
The concept was intriguing, early in the tour, but the production sorta lurched from scene to scene. Errico's "I Could Have Danced All Night," however, was a stunner.