The UCO 1987 came into force on 1 June 1987. The UCO 1987 revoked the
Town and Country Planning (Use Classes) Order 1972 (
SI 1972/1385), which was the previous version of the legislation. Since it came into force, the UCO 1987 has been amended by a number of subsequent Statutory Instruments. In 1999, the functions of the Secretary of State under various sections of the Town and Country Planning Act 1990 (including sections 55 and 333), so far as exercisable in relation to Wales, were transferred to the
National Assembly for Wales. This means that, since 1999, the UCO 1987 has been amended by some statutory instruments that apply in relation to England only and some that apply in relation to Wales only, resulting in different versions of the UCO 1987. With respect to England, the
Planning Portal website provides a page that summarises the Use Classes. With respect to England, the Planning Jungle website states that the UCO 1987 has been amended by a total of 14 subsequent statutory instruments. The website
legislation.gov.uk, which is delivered by the National Archives, provides the original ("as made") version of the UCO 1987, but states that UK statutory instruments are not carried in their "revised" form on the website. ==Operation of the UCO 1987==