The National Audit Office has existed in its present form since 1983. The public audit function in United Kingdom central government has a much longer history:
Parliament had for several centuries been responsible for raising revenue and authorising expenditure – and the nation had fought a civil war largely on this issue – but Parliamentary control and scrutiny of public spending was weak.
It was not until the 1860s that the first major steps towards proper financial accountability to Parliament were taken.
The champion of reform was William Ewart Gladstone, who was Chancellor of the Exchequer from 1859-1866.
As Chancellor, Gladstone initiated major reforms of public finance and Parliamentary accountability:
The C&AG was given two main functions:
The 1866 Act established a cycle of accountability for public funds:
From the 1870s, the PAC took evidence from senior officials, normally Heads of Departments, who were designated as Accounting Officers by the Treasury.
Initially, the C&AG and his staff were required to examine every transaction.
This became more unrealistic as the level of government activity expanded, particularly during the First World War.
The 1921 legislation allowed the C&AG to rely in part on departmental systems of control and thus examine a sample of transactions, rather than all of them.
This Act also required the C&AG to report to Parliament that money had been spent in accordance with Parliament’s wishes.
From the 1960s onwards, concerns were expressed by Parliamentarians and academics that the scope of public audit needed to be modernised to reflect the significant changes in the role of government over the course of the twentieth century.
In particular, it was argued that there was a need for a specific power to allow the C&AG to report to Parliament at his own discretion on the value for money achieved by government departments.
Reformers also argued that more robust arrangements should be put in place to ensure the independence of public auditors from government.
These changes were reflected in the National Audit Act 1983. This was originally a private member’s bill, which commanded wide all-party support.
Under the Act, the C&AG:
By the turn of the century, legislative change was again required to reflect further changes to the way that government was structured. Reform addressed the C&AG’s role in relation to non-departmental government bodies and the governance arragements of the NAO.
Under the Government Resources and Accounts Act 2000, resource (accrual) based accounting and budgeting for Department Accounts was introduced. Accounts were previously prepared on a cash basis. The Act also provided for the preparation and audit of consolidated accounts for the whole public sector (Whole of Government Accounts), to be audited by the C&AG.
In 2001 Lord Sharman’s review of audit and accountability for central government, “Holding to Account”, was published. In response to Lord Sharman’s report the government accepted the principle that the C&AG should audit all NDPBs, and that the audit appointment should be set out in statute. The government undertook to include this audit provision when new bodies are set up, and to use a provision in the Government Resources and Accounts Act to put the C&AG’s audit of existing bodies onto a statutory footing. For public bodies established as companies, the government agreed to rectify a provision in companies legislation that prohibited the C&AG being appointed the auditor of companies. This was addressed in the Companies Act 2006, and the C&AG is now able to compete for the audit of public bodies established as companies.
In 2007 TPAC commissioned a review of corporate governance at the NAO. As a result of the review, the Commission made a number of recommendations that have now been incorporated into the Budget Responsibility and National Audit Act (BRANA).
The Act established the NAO as a corporate body led by a Board consisting of four executive members (including the C&AG as Chief Executive) and five non-executive members (including a Chairman).
The Board is charged with setting the strategic direction for the NAO and supporting the C&AG, who retains his independence in terms of his statutory functions and his audit judgements. The C&AG will also remain an independent Officer of the House of Commons but now has a fixed term of ten years instead of an unlimited tenure.
In 1983, the Audit Commission Act established the Audit Commission to oversee and audit local government and other local public bodies including police authorities, health authorities and housing associations. In August 2010, the government announced its intention to abolish the Audit Commission. At March 2011, the implementation of any changes will be subject to legislation.
The Wales Audit Office is headed by the Auditor General for Wales who directly audits the Welsh Assembly Government and the NHS in Wales or, in the case of local government, appoints auditors to undertake financial audit and examine local value for money matters. He reports to the Welsh Assembly.
The Auditor General, who scrutinises the Scottish Government and bodies including the Scottish NHS; and the Accounts Commission for Scotland, which oversees local government audit, are both supported by Audit Scotland.
There has been a separated Comptroller and Auditor General for Northern Ireland since the foundation of the state in 1921. He heads the Northern Ireland Audit Office which audits central and local government functions and reports to the Northern Ireland Assembly.