That begins two years of negotiations – although the process could be extended if Britain and all other EU countries unanimously agree.
In a BBC interview ahead of a speech to the annual conference of her ruling Conservative Party, she said: “I have been saying that we wouldn’t trigger it before the end of this year so that we get some preparation in place.
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“I will be saying in my speech today that we will trigger [Article 50] before the end of March next year.”
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