A super-complaint is a complaint made in the UK by a state-approved 'super-complainant'/watchdog organisation on behalf of consumers, which is fast-tracked by the Office of Fair Trading

Office of Fair Trading

The Office of Fair Trading is a not-for-profit and non-ministerial government department of the United Kingdom, established by the Fair Trading Act 1973, which enforces both consumer protection and competition law, acting as the UK's economic regulator...

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For a super-complaint to be valid, it has to be about a "market feature, or combination of features, such as the structure of a market or the conduct of those operating within it, that is or appears to be significantly harming the interests of consumers"

There are currently 8 super-complainants:

• Which?
  Which?
  Which? is a product-testing and consumer campaigning charity with a magazine, website and various other services run by Which? Ltd ....
  
  
• National Consumer Council
• Citizens Advice
• Energywatch
• Consumer Council for Water
  Consumer Council for Water
  The Consumer Council for Water is a non-departmental public body that represents water and sewerage consumers in England and Wales. The organisation provides impartial advice and/or advocacy for aggrieved consumers....
  
   (formerly known as Watervoice)
• Postwatch
• CAMRA
• General Consumer Council for Northern Ireland
  General Consumer Council for Northern Ireland
  The General Consumer Council for Northern Ireland was created by the Government in 1985 and is funded by the Department of Enterprise, Trade and Investment . The body aims to represent consumers' interests....
  
  

What Car?

What Car?

What Car? is a long-running UK monthly automobile magazine and website, currently edited by Steve Fowler and published by Haymarket Motoring. First published in 1973, it is intended primarily as a magazine for consumers rather than dedicated automobile enthusiasts...

has applied, but was rejected