Who is Mark Sedwill and why is the top civil servant resigning?

Departure of career diplomat seen as victory for PM’s chief aide Dominic Cummings

Mark Sedwill
Mark Sedwill with Boris Johnson after December election, as Dominic Cummings lingers in background (R)
(Image credit: Stefan Rousseau/WPA Pool/Getty Images)

The UK’s most senior civil servant has announced that he is to step down as both cabinet secretary and national security adviser in September.

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