Report a problem to the CMA
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.
The CMA cannot provide legal advice.
Report a problem to the CMA
Report competition, consumer or market problems to the CMA:
- online: Report a problem to the CMA
- by email: general.enquiries@cma.gov.uk
Report a cartel to the CMA
A cartel is when 2 or more rival businesses agree to act together instead of competing. Cartels are illegal and there are serious consequences if you are caught in one.
If you are not involved in a cartel but know about one, report it to us. You could get a reward of up to £250,000 for information that leads to an investigation.
Report a cartel:
- online: Make an online report
- by phone: 020 3738 6888
- by email: cartelshotline@cma.gov.uk
Find out more about cartels and how to avoid them.
If you or your business has been involved in a cartel, contact our leniency programme by phone: 020 3738 6833.
Find out more about our leniency programme.
Make a whistleblower report
The CMA is a ‘prescribed body’, which means you can tell us if you have information about your employer (or ex-employer) possibly breaking competition or consumer protection law.
You can report wrongdoing that relates to any area of our work, such as mergers, consumer protection, competition enforcement and digital markets.
You can report whistleblowing concerns to the CMA:
- online: Make a whistleblower report
- by phone: 020 3738 6556
- by email: whistleblower@cma.gov.uk
Our guide to whistleblowing explains when and how to make a report, how we protect your identity, and what happens after you make a report.
Checking with us if someone has contacted you claiming to be from the CMA
If you receive a call, email or letter claiming to be from the CMA and want to check it is genuine, contact our General Enquiries team:
- by phone: 020 3738 6000
- by email: general.enquiries@cma.gov.uk
The CMA will only send emails from an email address ending ‘@cma.gov.uk’ and will never ask for bank account or payment details.
If in any doubt, use contact details published on GOV.UK - either our General Enquiries team or the contact details on the relevant case page.
Do not give out private information (such as bank details or passwords), reply to text messages, download attachments or click on any links in emails if you’re not sure they’re genuine.
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
- financial services: Financial Conduct Authority
- gas and electricity in England, Wales and Scotland: Ofgem
- gas, electricity, water and sewerage in Northern Ireland: Utility Regulator
- payment systems: Payment Systems Regulator
- railways in England, Wales and Scotland: Office of Rail and Road
- television, radio, telephone, postal and internet services: Ofcom
- water and sewerage services in England and Wales: Ofwat
- if you think advertising rules have been broken: the Advertising Standards Authority