Oliver Lansley has just come out of a meeting with the BBC.

Having correctly identified the strong characters, quickfire banter and unusually high joke count, they want to make his play, Immaculate, into a sitcom.

Lansley is tempted, obviously, but then he has to weigh it up with the film offers. And besides, he always loved the rawness of theatre, the way in which, as a young and frequently inspired writer/director, you can simply "write it down and put it straight out there".

Although he has had regular hits there in the past, things started hotting up for Lansley at Edinburgh 2005, where he and his company Les Enfants Terribles staged his latest play, Immaculate.

The Stage raved about its "winning formula of talent, charm and absolute irreverence", other critics were led to declare it the funniest comedy on the Fringe and, if reports are to be believed, Lansley's pacey and clever writing had entire audiences weeping with laughter in under five minutes.

It all started when one of his actor friends, who was pregnant at the time, complained there were no good parts for pregnant women.

Having previously written a "one-man multimedia gothic fantasy" (2002's The Germinator) and a series of relationship monologues entitled Bedtime Stories, he was already looking to do "something a bit grand a big story, which there aren't enough of these days."

So he hit upon modernising the idea of the immaculate conception. The result, comically enough, is "a biblical drama in a kitchen-sink setting".

Mia is young, free, single and under the belief she hasn't had sex for 11 months, when she wakes up one morning to find herself pregnant.

To make matters worse, the Angel Gabriel turns up on her doorstep claiming parentage.

To complicate matters further, he is closely followed by her highly strung ex-boyfriend Michael, blind with panic at the thought of paternity, and Lucifer, the Prince Of Darkness, who is adamant it is his hellish progeny.

As Gabriel (a "bumbling bank manager in sandals and socks") and Lucifer ("brilliantly camp in a swooshy coat and red stilettos") fight over the paternity rights, Immaculate throws up questions about relationships, responsibilities and religion as it spirals into Coward-esque farce.

"Mia was a lovely character to write because she's so headstrong and abrupt," says Lansley. "Her first question, when the Angel Gabriel comes down and declares her pregnancy is the Second Coming, is Okay, so is God going to be paying child support?' It was the idea of having someone who's usually totally in control of her life looking at the Second Coming in a very practical sense."

"If you want to take more from it, it's there, but you don't have to sit there all po-faced," he continues.

"Immaculate isn't an interpretative piece of modern dance. It is shamelessly entertaining."

Starts at 8pm, tickets cost £8 and £6. Call 07733 222006.