The Financial Services Authority (FSA) was a quasi-judicial body accountable for the regulation of the financial services industry in the United Kingdom between 2001 and 2013. It was founded as the Securities and Investments Board (SIB) in 1985. Its board was appointed by the Treasury, although it operated independently of government. It was structured as a company limited by guarantee and was funded entirely by fees charged to the financial services industry.

His Majesty's Treasury, occasionally referred to as the Exchequer, or more informally the Treasury, is a ministerial department of the Government of the United Kingdom. It is responsible for developing and executing the government's public finance policy and economic policy. The Treasury maintains the Online System for Central Accounting and Reporting, the replacement for the Combined Online Information System, which itemises departmental spending under thousands of category headings, and from which the Whole of Government Accounts annual financial statements are produced.