There is no interval and you are told at the beginning the doors are locked and you can't leave....I don't know how true...I didn't try.
It's cleverly scary but honestly not terrifying....and if you go take note of strange things around you in the auditorium and the bar.....seemingly insignificant or puzzling but the penny drops later...
I have never revealed the ending.....but take note of the dropped pen.....☻
"the doors are locked and you can't leave"
I think the fire authorities may have something to say about that especially in London. But I can see how it might play on the mind.
Just had a chat with the daughter, Rocky...she saw it with me and says they have changed bits for this production so I would go again.....see you there?.........☻