http://www.legislation.gov.uk/uksi/1986/2202/article/1/made
The Reservoirs Act 1975 (Commencement No. 4) Order 1986
Westlaw
King's Printer of Acts of Parliament
2011-04-05
WATER, ENGLAND AND WALES
This order brings into force on 1st April 1987, in Greater London and the metropolitan counties, all the provisions of the Reservoirs Act 1975 not already in force in those areas. The majority of these provisions concern the safety of reservoirs. They require that suitably qualified engineers be employed in connection with their construction, inspection and supervision.
1
This order may be cited as the Reservoirs Act 1975 (Commencement No. 4) Order 1986.