It's as Seventies as flares and fondue but Saturday Night Fever has never gone out of fashion.

It is to film what Starsky And Hutch is to TV and, just like the slick crime fighting duo, remains cool to this day.

The mega success of this stage show is proof, if ever it were needed, of its enduring appeal. Since 1998, the show has had three West End stints and is now on its third national tour.

"It's a big responsibility dealing with an iconic movie," says producer Adam Spiegel (inset). "But I love a show which sells tickets and has people in the aisles."

This version stars Shaun Williamson, aka EastEnders' unfortunate Barry. He plays a new character called Monty, an amalgamation of the film's studio owner and drug dealing DJ.

"He's a serial womaniser, a dirty old man," says Adam. "He wears ridiculous outfits and he's utterly hilarious."

Another recognisable face is leading lady Rebecca Dent, winner of Channel 4's talent show Musicality. Adam has no qualms about casting a reality TV star.

"Eighteen months ago she was pulling pints in Manchester but she's a proper talent, a great, great girl," says Adam. "We wouldn't have her in the show if she wasn't the best.

"We audition very carefully. Theatre is unforgiving. If a show's no good you get found out and it closes.

"This country has such talent in musical theatre. When we were auditioning, we were turning away at the first hurdle people who were far better than the finalists of X Factor."

Saturday Night Fever tells the story of 19-year-old wideboy Tony Manero, a dance fanatic who lives for the weekends, when he can thrust and grind at his favourite club.

"He's a working-class boy from Brooklyn, who works in a paint shop. But on a Saturday night, for just four hours, he's the king, he's the guy. Then it's back to carrying paint," Adam says.

It's not all glitter balls and sequins, though. At times, the story is dark and brutal, with scenes of violence, rape, drug taking and suicide.

"It's not a beautiful story, it's pretty nasty stuff," says Adam. "There's a lot of X-rated stuff which we have to soften. The movie is explicit but we take the edge off that - we suggest something explicit is going on. You can't expect a musical to reproduce a duplicate of the film. You take the spirit of the film but make sure the show benefits from the things theatre does well - like singing and dancing."

Adam has loved Saturday Night Fever since he first saw it at the age of 12 and says he will never tire of it.

"I still remember the first time I watched it. Back then, of course, people didn't realise it would become iconic. No-one knows what cultural icons we'll produce. What will history make the defining moment of this decade?

A movie about two gay cowboys? The Lord Of The Rings trilogy?

"Who would have thought one person in a white suite would define the Seventies?"

Mon-Thurs 7.45pm, Fri 5.30pm & 8.30pm, Sat 2.30pm & 7.45pm. Tickets £18-£29.50. Call 08700 606650.