The official UK government register of UK companies.
Office of Fair Trading
The Office of Fair Trading enforces consumer protection law and competition law. It also reviews proposed mergers and conducts market studies.
The Insolvency Service
The Insolvency Service deals with insolvency matters in England and Wales and some limited insolvency matters in Scotland.
Information Commissioner’s Office
The information Commissioner’s Office is responsible for regulating and enforcing the access to and use of personal information.
Her Majesty’s Revenue & Customs website includes information about the UK’s customs and tax department and includes the prototype online VAT returns system.