He mentions Mick North, whose only daughter Sophie, five, died in the gym. Mr North's wife had died of cancer two years before and he remains tortured that he did not keep his promise to his dying wife to keep Sophie safe. Mr Hopper seems to feel it is distasteful for anyone to muscle in on such grief.Mr Hopper reckons he's an unemotional guy, but 10 years on the tragedy can still creep up and take him by surprise "When I think about how young the victims were I get upset It's mainly anger. They didn't get their chance." On that terrible snowy morning, all that the children might have been was simply and viciously snuffed out.Steven Hopper appears on Five's 'Dunblane: A Decade On' this Wednesday at 8pm. Night time, at Ealing Studios.

On a back lot the premiere of Carry On Up the Khyber is being recreated. Here is the red carpet, the cheering crowds, the pressmen with their carbon flashbulbs. A Bentley rolls up and out steps Kenneth Williams, nostrils blazing, black tie immaculate, the skin stretched over his cheekbones in a rictus of delight. He gallantly takes the arm of his date for the evening, his mother Louie, and then sums up the crowd, the lights, the whole ecstasy of attention with one strangulated, orgasmic word: "Fantabulosa!" "Cut!" calls the director Andy de Emmony. The cheering crowds revert to being chilly extras muttering about overtime, and the "pressmen" put down their props and go in search of location catering Louie Williams becomes the actress Cheryl Campbell. And Kenneth Williams disappears gradually, like the Cheshire Cat, as the rigidity in his backbone relents, his nostrils relax and his vowels are repatriated. Soon just the actor Michael Sheen remains, saying gently in his native Welsh accent "Shall we get into the car for warmth, then?" Inside the Bentley, the actors take turns at sharing a hot water bottle (rather generously they also offer it to me).

Cheryl Campbell has a sore tooth, so she holds her mouth with a hankie while Michael Sheen takes her mind off it by recounting a story about the time he took his father as his date to the premiere of the film Bright Young Things (in which Sheen starred as Miles Malpractice) "The crowd went wild when my father got out of the car Screaming, cheering, wanting his autograph. We couldn't work out what was going on until the penny dropped. You see, my father works part-time as a Jack Nicholson impersonator..."Cheryl Campbell gurgles appreciatively. A runner pops his head into the car, collects the hot water bottle and gives them notice for the next take; the illusion re-assembles itself, and again out of the car springs Kenneth Williams.It is currently a good time to be a great British post-war institution with an interesting private life. Anyone who answers to that description is now likely to get a BBC TV biopic made about them. In a period of about a year we have had Kenneth Tynan: In Praise of Hardcore; Elizabeth David: a Life in Recipes; Not Only But Always (a biopic of Peter Cook) A life of Fanny Craddock is also in the works at BBC4.

The time is therefore ripe (you can almost hear him saying it - "Rrrripe, my deahs!") for Fantabulosa, the film of the life of Kenneth Williams.He left excellent biopic material behind him when he died by his own hand in 1988 at the age of 62: a great public legacy of catchphrases ("Stop messin' about!"; "Hello I'm Jules and this is my friend Sandy. We're Bona Artistes...") and high campery, spanning Round the Horne, Hancock's Half Hour, and 24 Carry On films; and a great private ledger of grief in the form of his daily diary, which he kept for 43 years. Splice the two together and you have, as Ben Evans, the producer of Fantabulosa, told me, "humour and tragedy, pathos and bathos - it's all there." It also has one hell of a central performance.Portraying the whinnying, goggle-eyed Williams is somewhere between heaven and hell for an actor, and the producers considered candidates including Chris Barrie, the Red Dwarf comedian; David Benson, an actor who has toured the country with his one-man tribute show Think No Evil of Us: My Life with Kenneth Williams; Robin Sebastian, who got Williams spot-on in the recent West End hit Round the Horne Revisited; and Little Britain's David Walliams, a Williams devotee.In the end, though, Sheen won through because he was thought to be the most adept at physically inhabiting the role without reducing it to an impression. He has, after all, the background for it: he played Tony Blair in The Deal in 2003, and has since revived his Blair for Stephen Frears' new film The Queen, now in post-production; he is set to portray Dylan Thomas in a film about the poet and his wife, also forthcoming; and let us not forget that this chameleon ability also runs in Michael Sheen's family.First, can he do the voice? That trademark "wasp with adenoids"; the voice that, as Elaine Stritch remarked when she appeared with him on Just a Minute, "can turn one word into a three-act play". "He tended to speak incredibly quickly, going from 0-60 out of nowhere.