What is "darnhill"

Darnhill (or Darn Hill as recorded by the Ordnance Survey) is an area of Heywood, a town within the Metropolitan Borough of Rochdale, in Greater Manchester, England. In the 20th century, Darnhill was chosen as the location for a planned overspill housing estate for Manchester, to allievate quality housing shortages in that city. The Darnhill council estate is no longer overseen by Manchester City Council, but by the Guinness Trust Housing Association.