A particular plot point has been bothering me since I first re-read the play.

We got to the relevant scene at last night's rehearsal so I canvassed the actors' opinion. (Don't tell them anything you think. Ask only what they think.) "Well of course it's this because this....", said Patrick, as if it was exceedingly obvious and clear to all. "Of course it is", said Mum later in the pub. "Well, didn't you always...." said AD Emma and her voice trailed off as she realised that no, I didn't.

And now I think about it and indeed, it probably is this because this.

Lucky they know what they're doing. I'm just the person with the room keys really.