http://www.legislation.gov.uk/id/ukpga/Eliz2/9-10/34

http://www.legislation.gov.uk/ukpga/Eliz2/9-10/34/section/21/2012-04-01

Factories Act 1961

An Act to consolidate the Factories Acts 1937 to 1959 and certain other enactments relating to the safety, health and welfare of employed persons.