What were your fears as you set about making a film of a supposedly ‘unfilmable' book?   "The biggest thing was that it was a sacred text. And with Gabriel Garcia Marquez there are people who cannot possibly have known him who call him by his diminutive Christian name - he's known as ‘Gabo' - so there's a  kind of possessiveness which is very daunting. Beyond that this is a great, great book. I can be as snippy as I like about people thinking that they own it because I think I...