The UK’s top civil servant has announced he is standing down from the position.
Sir Mark Sedwill has announced he will leave his role as Cabinet Secretary, National Security Adviser and head of the Civil Service in September.
It is understood the government will return to having a separate cabinet secretary and national security advisor.
One of Boris Johnson’s closest allies, David Frost, is to replace Sir Mark as national security advisor.
Mr Frost is the UK’s current Brexit negotiator with the EU.
ITV News Political Editor Robert Peston also reports Mr Frost is close to the prime minister’s chief aide, Dominic Cummings, and the departure of Sir Mark is part of “Cummings’ long-standing plan to end Whitehall groupthink by replacing traditional mandarins with data scientists and physicists”.
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