The investigation carried out by Private Eye was alongside ‘Compassion in Care’ which is a charity set up to counter abuse in care homes. The organisation was set up by Eileen Chubb, a former care worker who witnessed abuse and who lost her job because she was a ‘whistleblower’. The organisation campaigns for the vulnerable in care homes.

The report highlights a number of concerns related to the CQC particularly how they have either ignored and in one case ‘upgraded’ via the now defunct star-system homes in which proven maltreatment has occurred
see here