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 phone: 020 3738 6000
• 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:

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You can report whistleblowing concerns to the CMA:

• online: Make a whistleblower report
• by phone: 020 3738 6556
• by email: whistleblower@cma.gov.uk

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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