Well, interestingly, I played a lot of American friends the Mr. Preview sketch, and they all enjoyed it.
However, when I played them the Cleopatra sketch with Glenda Jackson, that were all absolutely bowled over.
You watch it again- its full of ad-libs, it's very fast paced and more like US comedy.
Jackson, herself, has a masterful comic touch throughout.
Incidentally, when Eric throws the grapes on the floor, treads them, then picks up a glass of red wine, he necks it in one,
and coughs and stares at the glass, because it had been ribena in each rehearsal, and the production staff switched it for a strong red wine as a joke....