Helen Mark retraces the 46-mile route of the Ulster Canal, which was built in the 19th century but has been disused since the 1930s. Now plans have been proposed to reopen a stretch between County Armagh and County Monaghan. In the village of Benburb, she meets author and enthusiast Brian Cassells, who tells her about the history of the canal and paints a picture of what restoring it could mean
