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More than two hundred years since the construction of the North West's canals helped kickstart the industrial revolution, there's a campaign for one of its most spectacular sections to become a UNESCO World Heritage Site. The 16-lock flight at Marple in Stockport is one of the steepest in Britain and its Aqueduct is held up as an enduring example of engineering brilliance. Â鶹Éç Radio Manchester's Kevin Fitzpatrick reports.