There are high hopes for new movie "Filth". It's had glowing reviews, is based on the book of the same name by Irvine Welsh, who also wrote the now iconic story "Trainspotting" and stars one of the most prominent British actors of the moment, James McAvoy.br br However, McAvoy nearly missed out on the central role of the bigoted, sex obsessed drug-taking police officer. Irivine Welsh, who was there to launch the adaptation of his book on September 30th, didn't at first think he was suitable.br br (SOUNDBITE) (English) Novelist, Irvine Welsh, saying:br br "We just thought he was too young, but he roughs up really well and he morphs into this kind of bitter 40-year-old divorcee so well, and it's like his wife should be a bit worried like you know seven years down the line this is what you've got to look forward to.