The mystery of the League of Gentleman is not what kind of deeply buried childhood trauma inspired such monstrous creations as the wife collecting Papa Lazarou, the people eating Hilary Briss and the pig suckling Tubbs.
It's what does Jeremy Dyson, the unseen fourth musketeer in the comedy writing quartet, really looks like.
But the famously reticent Mr Dyson seems determined to retain his status as a man of mystery, roping in acclaimed character actor Michael Sheen to play him in the League's transfer to film, The League of Gentlemen's Apocalypse
"He (Jeremy) wanted to play himself and we said 'absolutely not'," laughs Steve Pemberton the actor who plays Tubbs and Pauline among a host of other grotesques.
The choice of Michael Sheen was apparently due to a uncanny similarity between him and Jeremy.
"If you know Jeremy he's got that lovely curly hair Michael had at that time, the same hairstyle," adds Steve.
All this of course will mean nothing to readers who still believe that Roy Chubby Brown* is a fat blue comedian's real name.
However, the League do not believe that ignorance of the twistedly surreal and perverse delights of the TV series, will hinder enjoyment of a full length feature devoted to the antics of the local people.
Mark Gatiss (aka Mickey Luv, Dr Chinnery etc) reveals that fans of the TV show had already voiced their concerns that some cinema goers just wouldn't get the joke.
"We strove very hard to make it 'gettable'. Having said that it is a spin off film - that's how we got the money!"
Reece Shearsmith (Papa Lazarou, Edward, Ross) adds. "You can't do a film relying on the fact that the however many million people that watched that programme will watch the film.
"We wanted it to be a comedy film in its own right. The idea that some characters realize they are characters in a comedy programme was a gettable concept."
Wary of disappearing up their own plot device they decided to concentrate on just three characters from Royston Vasey who cross over to the real world to confront the League and persuade them to write more episodes.
"Between the three of us we have done 100 characters in the life of League of Gentlemen. For a 100 minute film we could either do one minute each or have a small group who would carry the story," explains Steve
"The main group just chose itself really, the more extreme characters didn't seem able to exist in the real world and do what we wanted, which was to try and integrate them into the world of 'us'."
Instead they chose to concentrate on satellite characters Herr Lipp (a camp German who looks like a former member of the Hitler Youth and can only speak in innuendo) and Geoff Tipps (deeply unfunny would be stand-up comedian) with Hilary Briss (butcher and purveyor of mystery meat) as their leader.
They still managed cameos of a few familiar favourites, which led to some confusing moment when the League, who were playing themselves as well, had to confront the Royston Vasey locals they would normally play.
"All the doubles were male so they had to go through everything with us, they had to have our costumes and our paddings and have their noses up, even though we see very little of them apart from the back of a head or a shoulder," explains Steve.
"There was a bit at the end when all the characters had to be there and they came in one at a time, all our characters, and it was really freaky, like the film coming to life."
"We had that a bit in the third series," adds Mark, "And the bloke who was my Mickey double was more like Mickey than I was."
In the flesh the League are a friendly and personable bunch, surprisingly ordinary looking considering the mutations of humanity they play in the series which began life on radio before being transferred to BBC Two where it scooped a Bafta and the Golden Rose of Montreaux.
Friends since college they have spent the last 20 or so years "in a sort of bubble" united by an offbeat and morbid sense of the ridiculous which, they claim, is not a sign of a deprived or damaged upbringing.
"Our humour is probably less about what happened to us in our our past and more what we watched on the telly - with the curtains drawn," reveals Steve.
"We kept being told to play out by our mums, but it's paid off. If you're a film fan you can see a lot of references in Apocalypse to stuff that we have enjoyed. Hammer House things like that."
They have occasionally ventured outside their bubble, Steve appeared in Shameless, Blackpool and, more recently, The Last Detective. Reece is about to appear on stage As You Like It with Sienna Miller, Helen McCory and Sean Hughes while sci fi fan Mark wrote the chilling Doctor Who episode featuring Simon Callow as Charles Dickens.
"I just did the Quatermass Experiment and I saw a review which said 'Mark Gatiss reminding us that he is a straight actor, not just a comedian'. 'Not just'!" says Mark, mockingly indignant.
After that they plan to reunite the villagers once more and take Royston Vasey on the road for The League of Gentleman Are Behind You tour.
"We've reached a natural crossroads," admits Mark, "The BBC have asked us to do another series but it just depends. We'd love to do another movie but we have to see how this one does really."
They are surprised at how well their creations have translated, not just to different mediums but also to different cultures.
"It's been a success everywhere," says Steve. "Finland, Poland, Eastern Europe..."
"It's a lifestyle they aspire to," jokes Mark. "In Japan the series is called Psycho-Ville!"
"If only we'd thought of that,' comments Steve.
The countries that have bought the series have remained faithful to the idea that it is men playing all the roles, including those of sex crazed women and one gender-confused taxi driver, using male actors to dub the voices.
There is always something, however, that gets lost in translation, as Mark explains
"There was a review of one of our books in Dutch and Steve put it through one of those internet translators and a line came out 'Jeremy is a little cotton reel'. We never understood what it was supposed to mean."
* Royston Vasey is Roy Chubby Brown's real name.