It is dark as you enter the King's Head theatre with your hand stamped and a glow stick. Nineties club music pounds out and laser lights show up a group of bodies pulsating in time to the music. If you couldn't just about make out the people sat on chairs and steps or standing wherever they can find space you'd think you'd stumbled into the wrong place. Someone tries to usher to you towards a seat you can't make out; we are a long way from the blue-rinse brigade of the Hampstead Theatre now.
If you haven't seen the iconic film (or read the novel) about a group of heroin addicts living in recession hit Edinburgh this may all come as a bit of a shock and be a little bit confusing. If you are familiar with the story this explosive and immersive play will probably still come as a bit of a shock. Certainly it isn't for those who like to sit back and quietly enjoy a night at the theatre.