Check the list below to see if the service you want to complain about is included. You can also find out more about what we can and cannot help with.
If you have any questions, call us on 0345 015 4033.
- Cabinet Office
- Capital for Enterprise Limited
- Care Quality Commission (CQC)
- Central Advisory Committee on Pensions and Compensation
- Central Bureau for Educational Visits and Exchanges
- Certification Officer for trade unions and employers' associations
- Charity Commission
- Child Benefit Office, HM Revenue and Customs
- Child Support Agency (CSA) or Child Maintenance Service
- Children and Family Court Advisory and Support Service (CAFCASS)
- Civil Aviation Authority
- Civil Justice Council
- Coal Authority
- Commission on Human Medicines
- Commissioner for Victims and Witnesses
- Commissioners of Northern Lighthouses
- Committee on Climate Change
- Committee on Mutagenicity of Chemicals in Food, Consumer Products and the Environment
- Committee on Radioactive Waste Management
- Committee on Toxicity of Chemicals in Food, Consumer Products and the Environment
- Commonwealth Scholarship Commission in the United Kingdom
- Community rehabilitation companies
- Companies House
- Competition and Markets Authority
- Competition Service
- Construction Industry Training Board
- Consumer Council for Water
- Corporation of the Trinity House of Deptford Strond (Trinity House)
- Council for Science and Technology
- Court Funds Office
- Criminal Injuries Compensation Authority
- Crown Estate Office
- Crown Prosecution Service (only if you are a victim of crime, under the Victim's Code)