Former senior civil servant Sue Gray, who became a household name as the Partygate investigator, is at the centre of fresh controversy over the revelation she is paid more than her boss - the prime minister.

The Downing Street Chief of Staff was previously tasked with investigating breaches of the Covid-19 restrictions in the government

The top salary under Rishi Sunak went to his chief of staff, Liam Booth-Smith, who was paid up to £149,999 - but the ceiling for special advisor pay had not been increased since 2019