Editing Middlesex (section)

====Areas transferred to Surrey and Hertfordshire County Councils====
The remaining areas were [[Potters Bar Urban District]], which became part of the administrative county of [[Hertfordshire]], and [[Sunbury-on-Thames Urban District]] and [[Staines Urban District]], which became part of the administrative county of [[Surrey]].<ref name=vision_mx/> Following the changes, local acts of Parliament relating to Middlesex were henceforth to apply to the entirety of the nine "North West London Boroughs".<ref name=local_law>The Local Law (North West London Boroughs) Order 1965 (S.I. 1965 No. 533)</ref> 

In 1974, the three [[Urban district (Great Britain and Ireland)|urban districts]] that had been transferred to Hertfordshire and Surrey were abolished and became the districts of [[Hertsmere]] (part only) and [[Borough of Spelthorne|Spelthorne]] respectively.<ref name="autogenerated1">The English Non-metropolitan Districts (Definition) Order 1972 (SI 1972/2038)</ref> In 1995 the village of [[Poyle]] was transferred from Spelthorne to the [[Berkshire]] borough of [[Slough]].<ref name=poyle>Office of Public Sector Information – [http://www.opsi.gov.uk/si/si1994/Uksi_19940330_en_1.htm Berkshire, Buckinghamshire and Surrey (County Boundaries) Order 1994] {{webarchive|url=https://web.archive.org/web/20090202095925/http://opsi.gov.uk/SI/si1994/Uksi_19940330_en_1.htm |date=2 February 2009 }}. Retrieved 20 February 2008.</ref> Additionally, the Greater London boundary to the west and north has been subject to several [[List of Greater London boundary changes|small changes]] since 1965.<ref>Office of Public Sector Information – [http://www.opsi.gov.uk/si/si1993/Uksi_19931342_en_1.htm The Heathrow Airport (County and London Borough Boundaries) Order 1993]. Retrieved 23 February 2008.</ref><ref>Office of Public Sector Information – [http://www.opsi.gov.uk/si/si1993/Uksi_19931391_en_1.htm The Greater London and Surrey (County and London Borough Boundaries) (No. 4) Order 1993]. Retrieved 23 February 2008.</ref>