In the course of a single evening, I have taken part in a group therapy session, jumped into bed with eight strangers, gone back to school and signed away my rights in order to become a father.

That may be a typical Friday night for some, but for me it was the product of a busy night's haggling in a pop-up theatrical marketplace.

The bowels of the old BBC studios, in Marylebone High Street, had been temporarily converted into the thespian equivalent of Covent Garden Market for Theatre Delicatessen's week-long SPACED festival.

As theatregoers plotted and carried out a daring raid on the floors above in Heist, we enjoyed a more pick and mix approach to immersive theatre.

Armed with a two-sided 'menu' of the 17 interactive performances on offer, we were invited to pick a door and briefly enter one of the many different worlds created for our entertainment.

Theatre Delicatessen's SPACED festival, at the old BBC studios, in Marylebone High Street. The Butcher of Baker Street, by Forked Path (photos by Hannah Aneketell)

With audiences having stumped up the £10 entry fee, some artists asked for an upfront contribution and others asked you to pay what you thought it was worth, which ranged from an apple to £10. As a rough guide, £10 in loose change should see you through the evening.

I only managed to sample about a third of the shows - some of which spill out into the main arena, giving you a tantalising glimpse of what's in store - but the breadth of ideas and quality I experienced was remarkable.

Stage actors love telling you how no two performances are the same but that's definitely the case with SPACED.

While some shows seemed tightly scripted, other artists went with the flow, meaning your input could send proceedings off on a wild tangent.

My favourite offering was 'Duvet Day', by Touchpaper, which combined anarchic fun with a moral conscience.

On entering the room I was handed a fetching pink Slanket (blanket with sleeves) and invited to snuggle up under a duvet with my new friends.

We were soon having a great time, playing 'would you rather' while scoffing sweets and biscuits, until our hosts conked out and a trio of mysterious voices beckoned us from behind the curtains. I won't tell you what happened next but it was a sweet and clever performance.

Theatre Delicatessen's SPACED festival, at the old BBC studios, in Marylebone High Street. Between Us, by The Lab Collective (photos by Hannah Aneketell)

Equally intriguing but less successful was Mika Hockman's 'It', in which you are invited into the psychiatrist's office and asked to help a mute dummy rediscover its identity.

It's a nice idea but felt quite laboured and at times extremely uncomfortable, to the extent that two people walked out halfway through. It did feel like half an hour wasted but there were some interesting ideas about identity struggling to get out and perhaps with a different group of participants it would have worked better.

Among the other acts I sampled were The Class of '14, in which a manic teacher set us an exercise before going into meltdown before our eyes, and Welco Fertility Tech, a dystopian fantasy in which we were invited to procreate with potentially disastrous consequences.

Theatre Delicatessen's SPACED festival, at the old BBC studios, in Marylebone High Street. Class of '14, by Eleanor Massie (photos by Hannah Aneketell)

Unfortunately, the tiny audience sizes meant some shows sold out very quickly and there was a bit of dead time, though there were pieces you could dip in and out of, like a confessional circus show, an improvised boxing match in which you could help control the outcome and a grinning, glitter spraying raver who just wanted someone to dance with.

The atmosphere was somewhere between a nightclub and a festival, with theatregoers sharing suggestions as the evening progressed.

As immersive theatre goes, while I sometimes felt like I was drowning, the current carried me to some new and interesting places, and it definitely beats a night on the sofa watching Graham Norton.

* SPACED ended on Saturday, March 22. Visit www.theatredelicatessen.com for the latest from Theatre Delicatessen and its partners.