Matt Chorley speaks to Patrick Maguire, the Red Box Editor, who broke the story that US diplomats had issued an extraordinary rebuke to Boris Johnson's government over the impact of Brexit in Northern Ireland. We also hear from Sir Peter Westmacott, a former British ambassador to Washington, and Lewis Lukens, a former US diplomat in London.

PLUS India Knight and James Marriott on how the culture wars might be fizzling out.

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