Competition and Markets Authority (CMA)
This corner of the Government’s web presence has a good amount of legal content, including information on the Competition Act, and CMA cases.
Financial Conduct Authority (FCA)
A really well set out website, this section deals with common consumer issues and provides good jargon-free advice on what to do. Of particular interest is the list of common scams to look out for and avoid!
Chartered Trading Standards Institute
The one-stop shop for consumer protection information in the UK maintained by the Chartered Trading Standards Institute. Loads of information aimed at consumers, business, schools and others.
For a huge selection of topics concerning the consumer and business interest in the context of EU law and policy.
Citizens Advice Scotland Consumer Service
A good collection of basic advice articles on a number of common consumer problems e.g. car repairs, cancelled flights, switching energy providers. It also includes template letters which can be used to make complaints or request refunds in different circumstances.