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Boundary-Line files and sub-levels includes: County - The named county, district, district ward, civil parish, county electoral division (ED); European constituencies - The named European region; Greater London Authority - The Greater London Authority, Greater London Authority Assembly constituency, London borough, London borough ward; Metropolitan districts - The named metropolitan district, metropolitan district ward, civil parish where appropriate; Scottish parliamentary electoral region - The named Scottish Parliamentary electoral region, Scottish parliamentary constituency; Unitary authorities- The named unitary authority, unitary authority ward or unitary authority ED as appropriate, civil parish where appropriate, together with community in Wales; Welsh Assembly Electoral Region - The named Welsh Assembly electoral region, Welsh assembly constituency; Westminster constituencies - The named Westminster constituency; Extent of the realm - Low water mark or seaward boundary extension. 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