http://www.legislation.gov.uk/id/ukpga/1964/48

http://www.legislation.gov.uk/ukpga/1964/48/section/59/1999-04-01

Police Act 1964

An Act to re-enact with modifications certain enactments relating to police forces in England and Wales, to amend the Police (Scotland) Act 1956, and to make further provision with respect to the police.