R v Secretary of State for the Home Department, ex p Simms [2000] 2 AC 115

Simms and another prisoner maintained that they had been wrongly convicted. Journalists wished to interview them while investigating their cases, but the Home Secretary's prison policy prohibited oral interviews where the resulting material was intended for publication, unless the journalist agreed not to publish it. Written correspondence could be published, but the prisoners argued that face-to-face interviews were necessary for effective investigative journalism and efforts to challenge their convictions. The policy was made under broadly framed statutory powers to regulate prisons. The Home Secretary contended that the restriction maintained order and that Parliament had authorised rules governing prisoners' communications.

Did general statutory powers authorise a policy preventing prisoners from speaking to journalists for publication, or did the policy unlawfully interfere with freedom of expression under the principle of legality?

The House of Lords held the policy unlawful. Freedom of expression included the prisoners' ability to communicate with journalists investigating alleged miscarriages of justice. The restriction was broader than necessary to protect prison order and could not be justified by general rule-making language. Lord Hoffmann stated the principle of legality: fundamental rights cannot be overridden by general or ambiguous words because Parliament is assumed to confront the political cost of clear language when authorising such interference. Parliamentary sovereignty remained intact, since Parliament could legislate expressly. The doctrine instead controls statutory interpretation and prevents the executive relying on vague powers to curtail basic rights.

Under the principle of legality, courts presume that Parliament does not intend to authorise interference with fundamental rights through general or ambiguous words. Clear statutory language is required before executive action may lawfully override such a right, subject to any applicable rights-based justification.

Simms is a constitutional landmark linking common-law rights, statutory interpretation and parliamentary sovereignty. It does not empower courts to invalidate a clearly expressed Act of Parliament. Instead, it requires Parliament to speak unmistakably before fundamental rights are curtailed and ensures that ministers cannot find such authority in broad language. The Human Rights Act 1998 now supplies an additional interpretive and remedial framework, but the common-law principle remains important. R (Anufrijeva) v Secretary of State for the Home Department later applied legality to notice of decisions affecting rights.