http://www.legislation.gov.uk/uksi/1993/436/signature/made
The Cheshire, Greater Manchester, Lancashire and Merseyside (County and District Boundaries) Order 1993
Councils
King's Printer of Acts of Parliament
2017-05-25
LOCAL GOVERNMENT, ENGLAND AND WALES
CHANGES IN LOCAL GOVERNMENT AREAS
This Order makes changes in the boundary of the metropolitan county of Greater Manchester (metropolitan borough of Wigan) with–the county of Cheshire (borough of Warrington);the county of Lancashire (district of West Lancashire); andthe metropolitan county of Merseyside (metropolitan borough of St Helens). It also transfers areas within Greater Manchester between Wigan and–the metropolitan borough of Bolton; andthe city of Salford.
Robin SquireParliamentary Under Secretary of State,Department of the Environment