In a statement, Bruce said she will be leaving her role "with real sadness".
She added that her words has been "mischaracterised" in a "social media storm".
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Bruce then interrupted and told Ms Alibhai-Brown and the audience: ‘I’m not disputing what you’re saying, but just so everyone knows what this is referring to, Stanley Johnson’s wife spoke to a journalist, Tom Bower, and she said that
Stanley Johnson had broken her nose and that she’d ended up in hospital as a result.
‘Stanley Johnson has not commented publicly on that. Friends of his have said it did happen but it was a one-off.’
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What a ghoul