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Brexit is stress-testing Britain’s political and constitutional conventions to the very limit. With prime minister Boris Johnson apparently intent on ignoring the will of Parliament and exiting the EU at the end of October, the eye of the Brexit storm is fast approaching.

Stephen Sackur speaks to Heidi Allen MP, who quit the Conservative Party in early 2019 and co-founded a new pro-remain centrist party. But that bid to break the political mould failed. What does her experience tell us about the clarity and coherence of Brexit’s opponents?