Marianne Faithfull, the original Sixties wild child, tells Krissi Murison about lust, greed and the “enormous pressures” of being Mick’s girlfriend. From the moment I walk into Marianne Faithfull’s apartment in Paris’s sixth arrondissement, it feels like I’m back at school, being summoned into the headmistress’s office. She tells me off for everything. First, mumbling: “Sit nearer …