“That was like open heart surgery,” Marianne Faithfull said to British artists Iain Forsyth and Jane Pollard when they wrapped Broken English, their idiosyncratic documentary on the inimitable singer-songwriter. Faithfull – articulate, imperious and bloody-minded, with the hard-won humour and ravaged voice of a 60s survivor – was never, happily, going to be a grateful or mouldable subject. Even hooked up to an oxygen tank, she’s a clear-eyedhellip;

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