The CQC chair is appointed by the secretary of state for Health and Social Care in accordance with the Cabinet Office's Code of Governance for Public Appointments.

Dilks said: 'Although the last three years have at times been intensely challenging, I am confident that the organisation is on the path to recovery and can make the changes needed to become the strong, effective regulator that people who use and work in health and social care services need and deserve. I know CQC's staff, board and executive team are all fully committed to achieving this.

'I have decided not to seek reappointment primarily for personal reasons, but it will also give new leadership a chance to approach the challenges we face with a fresh perspective. I have indicated to the Secretary of State that I am committed to remaining in post and fully engaged until my successor has been identified and is able to take up the reins.

‘Sir Julian Hartley will be joining CQC as chief executive next week and I look forward to working with him in the months ahead, and to ensuing that my successor has a smooth transition when it is time for them to take up this demanding but hugely rewarding role.'