Sue Gray will leave her current role in government and aims to join the Labour Party as chief of staff.Downing Street said her resignation had been accepted with "immediate affect" on Thursday afternoon.Ms Gray's investigation into law-breaking parties at Downing Street during Boris Johnson's leadership played a key role in his downfall as prime minister.

Sue Gray will leave her current role in government and aims to join the Labour Party as chief of staff.Downing Street said her resignation had been accepted with "immediate affect" on Thursday afternoon.Ms Gray's investigation into law-breaking parties at Downing Street during Boris Johnson's leadership played a key role in his downfall as prime minister.