Thanks for helping improve the accuracy of the site. We’ve noted what item you were on; please now visit the web page of the duplicate of Gate Theatre Club production of The Marquis of Keith, by Frank Wedekind, Gate Theatre, Notting Hill Gate, London, 18th September – 13th October 1990 and click the button that will have appeared there.
If they have the exact same name, a search for Gate Theatre Club production of The Marquis of Keith, by Frank Wedekind, Gate Theatre, Notting Hill Gate, London, 18th September – 13th October 1990 will probably help.