Does anyone know the title of this play??

Hi There, I'm living in a remote part of Indonesia at the moment, resources are limited and I need a question answered if anyone can help?! A drama teacher I've met(also an expat Aussie) needs to find a play that she remembers seeing with John English in it ... I said I'd help out. Her words were: "it's about this acting compant putting on a show. The first act is the show they are putting on, the 2nd act was the behind the scenes and the 3rd back to the show now that you knew what was really going on. It was really clever " Does anyone know the name of the play?? Or, where we might be able to get a copy of it? I'm only a new member, so I'm not that well versed with this site, but would love some help. Thanks very much, Georgia