How best to make a competition or consumer law complaint and what happens next
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How to report a potential breach of competition or consumer law to the Competition and Markets Authority (CMA), and what to expect from us.
Adapted edition
- Document type
- Reference Guide
- Format
- DOCX
- Pages
- 5
- Language
- English
- Version
- 1.0
- Updated
- 2026-09-16
- Category
- Governance & assurance
- Licence
- Open Government Licence v3.0
Description
How to report a potential breach of competition or consumer law to the Competition and Markets Authority (CMA), and what to expect from us. Consult the original guidance for current legal and operational details.
Contents
- Making a complaint
- Making a well-reasoned complaint
- Provide as much hard evidence as you have
- Explain why you think the CMA should prioritise your complaint
- Our commitment to complainants
- What you can expect from us
- We will acknowledge your complaint but may not provide a substantive response
- We will keep you updated if there is a realistic prospect of us investigating
- We will objectively prioritise which cases to investigate
- We will respect confidentiality to the extent allowed by law
Source and licence
Competition and Markets Authority
AttributionCompetition and Markets Authority, ‘How best to make a competition or consumer law complaint and what happens next’ (updated 7 October 2025), reused under the Open Government Licence v3.0.
ChangesNeutral text-only adaptation from the official GOV.UK Content API body: headings, paragraphs, ordered and unordered list items and clickable source-link destinations in an appendix preserved. Images, logos, page design, accessible-format request widgets and linked attachments excluded; normalised whitespace, invisible format marks and typography.
Version history
- v1.016/09/2026