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In page Kirklees:

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The borough was formed on 1 April 1974 by the provisions of the Local Government Act 1972 as part of a reform of local government in England. Eleven former local government districts were merged: the county boroughs of Huddersfield and Dewsbury, the municipal boroughs of Batley and Spenborough and the urban districts of Colne Valley, Denby Dale, Heckmondwike, Holmfirth, Kirkburton, Meltham and Mirfield.[citation needed]