Report a problem to the CMA
Source: gov.uk (2025-10-07)

Tell the CMA about competition and consumer issues.

The CMA cannot step in or advise on individual complaints.

For help with your individual case or problem, contact the relevant consumer advice organisation in your area (https://www.gov.uk/consumer-advice).

Report a problem to the CMA

Report competition, consumer or market problems to the CMA:
- online: Report a problem to the CMA (https://www.gov.uk/guidance/contact-the-cma)
- by phone: xx-xxxx-xxxx
- by email: xxx@xxx.xx (mailto:xxx@xxx.xx)
Report a cartel to the CMA

Report a cartel:
- online: Make an online report (https://submit.forms.service.gov.uk/form/4822/report-a-cartel-to-the-cma)
- by phone: xx-xxxx-xxxx
- by email: xxx@xxx.xx (mailto:xxx@xxx.xx)
Find out more about cartels and how to avoid them (https://cheatingorcompeting.campaign.gov.uk/#what_is_a_business_cartel_).

If you or your business has been involved in a cartel, contact our leniency programme:
- online: Cartels: come forward and apply for leniency (https://www.gov.uk/guidance/cartels-confess-and-apply-for-leniency)
- by phone: xx-xxxx-xxxx
Whistleblowing

Whistleblowers are employees, or former employees, that report illegal activities carried out by the business or organisation they’re employed by.

If the illegal activity relates to the sale of products, the supply of services or about competition affecting markets in the UK, it’s important you report it to the CMA.

You can report whistleblowing concerns to the CMA:
- online: Make a whistleblower report (https://www.gov.uk/guidance/make-a-whistleblower-report)
- by phone: xx-xxxx-xxxx
- by email: xxx@xxx.xx (mailto:xxx@xxx.xx)
Find out more about whistleblowing (https://www.gov.uk/government/publications/whistleblowers-at-the-cma), including your rights and how the CMA will protect your identity.

What happens next

After you’ve submitted your complaint to us, you’ll receive an automated response via email and we’ll review all the information you provide.

We cannot respond in detail to individual complaints, but using your information we may:
- contact businesses involved with your submission
- investigate and take legal action against businesses
- conduct studies or investigations into markets
- prosecute people involved with cartels
If we decide to open a formal enforcement case, we may contact you and give you the opportunity to comment on it. We will contact you if we need to rely on the information you’ve provided to open the case. If you have any questions or concerns, please contact us at xxx@xxx.xx (mailto:xxx@xxx.xx).

When the CMA takes part in criminal enforcement work, it acts in accordance with the duties set out in chapter 5 of the code of practice for victims of crime (victims code) (https://www.gov.uk/government/publications/the-code-of-practice-for-victims-of-crime).

To find out more, read our guide on what to expect when you report a potential breach of competition or consumer law (https://www.gov.uk/guidance/how-best-to-make-a-competition-or-consumer-law-complaint-and-what-happens-next).

Report a problem to another regulator

In some cases, you may want to report your concerns to an industry regulator:
- airports and air traffic services: Civil Aviation Authority (https://www.caa.co.uk/home/)
- financial services: Financial Conduct Authority (https://www.fca.org.uk/)
- gas and electricity in England, Wales and Scotland: Ofgem (https://www.ofgem.gov.uk/)
- gas, electricity, water and sewerage in Northern Ireland: Utility Regulator (https://www.uregni.gov.uk/)
- payment systems: Payment Systems Regulator (https://www.psr.org.uk/)
- railways in England, Wales and Scotland: Office of Rail and Road (https://www.orr.gov.uk/)
- television, radio, telephone, postal and internet services: Ofcom (https://www.ofcom.org.uk/)
- water and sewerage services in England and Wales: Ofwat (https://www.ofwat.gov.uk/)
- if you think advertising rules have been broken: the Advertising Standards Authority (https://www.asa.org.uk/make-a-complaint.html)