The UK CAA is a public corporation of the Department for Transport. However, there is no one at the DfT who has any qualifications to provide oversight or assess their effectiveness, and they do not address complaints like we would expect from Ofgem or Ofwat. The UK CAA addresses complaints themselves.
What is a public corporation UK?
The UK form of organisation for nationalised industries. Public corporations were supposed to operate in the public interest, using capital provided by the government, but with managerial autonomy in day-to-day business.
Essentially they are self-regulating. We laugh at banana republics, but there ain't no corruption like the white man's corruption.