M&J Group Competition Law Hub
UK competition law explained through the lens of the M&J case — building topical authority.
Last verified: 5 October 2026
IMPORTANT DISTINCTION
The penalties described on this website concern failures to comply with CMA investigative requirements during an inspection.
The separate CMA investigation into suspected bid-rigging remains ongoing.
The CMA has expressly stated that no assumption should currently be made that competition law has been infringed.
This hub connects the M&J Group case to the wider framework of UK competition law. Each topic links to a dedicated article.
The Competition Act 1998
The UK's primary competition statute, including the Chapter I and Chapter II prohibitions.
Chapter I Prohibition
The prohibition on anti-competitive agreements between undertakings, including cartels and bid-rigging.
Bid-Rigging
How bid-rigging works in public procurement and why it is prohibited.
Cartels
The most serious form of competition infringement — and why the CMA has not found one here.
Public Procurement
How public contracts are awarded and why competition matters for taxpayer value.
CMA Investigative Powers
The CMA's powers of investigation, including search warrants and warranted inspections.
Search Warrants
How the CMA obtains and executes search warrants for dawn raids.
Document Preservation
The obligation to preserve evidence during investigations and the consequences of concealment.
Administrative Penalties
How the CMA imposes financial penalties on companies and individuals.
Individual Liability
When individuals face personal penalties — as in the landmark M&J case.
Statements of Objections
Provisional CMA findings that give parties a right to respond before a final decision.
Appeals
How CMA decisions can be appealed to the Competition Appeal Tribunal.