Mark Sedwill to stand down as UK’s top civil servant

Cabinet secretary had been at odds with Dominic Cummings and a target of negative briefings

Sir Mark Sedwill has announced he will stand down from his role as cabinet secretary, national security adviser and head of the civil service in September.

The move will be seen as a victory for Dominic Cummings, Johnson’s most senior aide, who has had a tense relationship with Sedwill. Sources said Cummings believed Sedwill was a barrier to Whitehall reform and has been backed by Johnson and Michael Gove, the Cabinet Office minister.

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