http://www.legislation.gov.uk/ukpga/Geo5/3-4/37/section/1National Insurance Act 1913An Act to amend Parts I. and III. of the National Insurance Act 1911.1979-08-31texttext/xmlenStatute Law Database2015-09-08Expert Participation2009-10-011. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F1