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  What we investigate

What the Commission investigates


Type of inquiry


Referring organisation

Completed merger

Enterprise Act 2002 s22 Office of Fair Trading
Anticipated merger Enterprise Act 2002 s33 Office of Fair Trading
Article 21(4) - protection of legitimate interests Enterprise Act 2002 (Protection of Legitimate Interests) Order 2003 Secretary of State
Merger raising public interest issues, including some newspaper and other media mergers Enterprise Act 2002 s45 Secretary of State
Merger raising special public interest issues Enterprise Act 2002 s62 Secretary of State


Enterprise Act 2002 s131, 132 Office of Fair Trading, sectoral regulators with concurrent powers (the Office of Communications (Ofcom), the Gas and Electricity Markets Authority (GEMA), the Director General of Water Services , the Northern Ireland Authority for Energy Regulation (NIAER), the Office of Rail Regulation and the Civil Aviation Authority) or Minister
Water merger Water Industry Act 1991 s32 The Office of Fair Trading
Water and sewerage, determination under conditions of appointment Water Industry Act 1991 s12 Director General of Water Services
Water and sewerage appointment modification Water Industry Act 1991 s14 Director General of Water Services
Water supply licence modification Water Industry Act 1991 s17K Director General of Water Services
Water and sewerage, determination appeals and licence modification references The Water and Sewerage Services (Northern Ireland) Order 2006 [SI 2006 N0.3336 (N.I. 21)] Northern Ireland Authority for Utility Regulation
Airport price regulation (quinquennial reviews) Airports Act 1986 s43 or Airports (Northern Ireland) Order 1994 art 34 Civil Aviation Authority
Gas licence modification Gas Act 1986 s24, or Gas (Northern Ireland) Order 1996 art 15 GEMA, NIAER
Gas non–licensable activities Gas Act 1986 s41E GEMA
Electricity licence modification Electricity Act 1989 s12, or Electricity (Northern Ireland) Order 1992 art 15 GEMA, NIAER
Electricity non-licensable activities Electricity Act 1989 s56C GEMA
Railways licence modification Railways Act 1993, s13 Office of Rail Regulation
Railways access charges Railways Act 1993 Schedule 4A Office of Rail Regulation
National Air Traffic System Transport Act 2000 s12 Civil Aviation Authority
Price control telecommunications references Communications Act 2003
s 193
Competition Appeal Tribunal
Postal services licence modification Postal Services Act 2000 s15 Postal Services Commission
Regulatory provisions or practices Financial Services and Markets
Act 2000 s162 or s306
Office of Fair Trading
Public bodies - efficiency and
Competition Act 1980 s11 Secretary of State
Scottish water price control and licence modification references The Water Services etc. (Scotland) Act 2005 (Consequential Provisions and Modifications) Order 2005 Water Industry Commission for Scotland
Energy Code Modifications Energy Act 2004 s173 (also The Electricity and Gas Appeals (Designation and Exclusion) Orders 2005 and 2009) GEMA
Regulatory Provisions of Practices Legal Services Act 2007 Lord Chancellor