The Freedom of Information Act 2000 is a significant constitutional measure. It provides a right of access to information held by a wide range of public authorities, from central and local government to the Zoos Forum. In addition, it makes substantial amendments to the regimes of data protection and public record-keeping. This is a detailed commentary on the Act. It explains the mechanism for seeking access to information, the complex series of exemptions that, in certain circumstances, permit public authorities to refuse access to information, and the powers of enforcement available under the Act. It also contains chapters on the historical development of open government in the United Kingdom and on freedom of information legislation in other jurisdictions. The book contains a copy of the Freedom of Information Act.