As far as i am aware and it is a while since i have seen the film that the track that you are referring too that Kevin & Perry had made themselves has never been released? I know i went and bought the soundtrack (which is pretty good) realyl for that one tune that i thought was the nuts but its not on there? if am thinking of the same tune i dont think it has ever been released. if i get time i will dig out the DVD and have a look at the credits at the end and hopefully i will be able to post my findings out tomorrow!