This is the original Equal Pay Act 1970 held in the Parliamentary Archives. It was passed on 29 May 1970, although it did not come into force until 29 December 1975. It established the principle that men and women should be paid equally for the same work, or work of a broadly similar nature, although many inequalities remained. You can read the full text at: http://www.legislation.gov.uk/ukpga/1970/41/contents/enacted