Cert 12

Joshua Marston went to Colombia to find actors for Maria Full of Grace, his film about drug mules. And that was just the first hurdle, he tells fellow director Anthony Minghella.

Two years ago Catalina Sandino Moreno was a student in Bogotá. Tomorrow she is in the running for an Oscar for her extraordinary performance in Maria Full of Grace. The film, telling the story of a Colombian drug-mule, was a revelation even to her, she tells Zoe Williams

London film festival