"Security Service Act 1989 (c. 5). 1989 Chapter c. 5." London: HMSO, 1989. ISBN 0105405892. [http://www.legislation.gov.uk/ukpga/1989/5/contents]
"An Act to place the Security Service on a statutory basis; to enable certain actions to be taken on the authority of warrants issued by the Secretary of State, with provision for the issue of such warrants to be kept under review by a Commissioner; to establish a procedure for the investigation by a Tribunal or, in some cases, by the Commissioner of complaints about the Service; and for connected purposes....
"The function of the Service shall be the protection of national security and, in particular, its protection against threats from espionage, terrorism and sabotage, from the activities of agents of foreign powers and from actions intended to overthrow or undermine parliamentary democracy by political, industrial or violent means....
"It shall also be the function of the Service to safeguard the economic well-being of the United Kingdom against threats posed by the actions or intentions of persons outside the British Islands."
"Security Service Act 1996 Chapter 35." London: HMSO, 1989.
"An Act to give the Security Service the function of acting in support of the prevention and detection of serious crime, and for connected purposes.
"[18th July 1996]
"Be it enacted by the Queen's most Excellent Majesty, by and with the advice and consent of the Lords Spiritual and Temporal, and Commons, in this present Parliament assembled, and by the authority of the same, as follows:-
"Functions of Security Service. 1. - (1) At the end of section 1 of the Security Service Act 1989 there shall be added-
"(4) It shall also be the function of the Service to act in support of the activities of police forces and other law enforcement agencies in the prevention and detection of serious crime."
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