His replacement? Ethics chief from Plebgate storm

SUE Gray has been described as the most powerful civil servant you have never heard of.

In her former job as director-general of propriety and ethics in the Cabinet Office she had enormous power and long experience in Westminster scandals, and developed a fearsome reputation among ministers and officials.

She dealt with complaints against ministers on behalf of the Cabinet Secretary and Prime Minister.

Her inquiry into the so-called Plebgate affair led to the resignation of minister Andrew Mitchell, pictured.

Her investigation into Damian Green led to his forced resignation after she discovered he had lied about pornography found on his Commons computer.

From 2018 to 2021 she served as the Permanent Secretary of the Department of Finance at the Northern Ireland Executive

She returned to London to head up work on the Union earlier this year.