The Blue Nile are the most enigmatic band in pop. Releasing just 4 albums in 20 years. Yet fans of their melancholic perfection include everyone from Peter Gabriel to 2016's hottest act The 1975. Ken Sweeney travels to Glasgow's to meet former members Paul Buchanan and PJ Moore and revisit with them, the Tinseltown In The Rain and Downtown Lights captured in albums A Walk Across The Rooftops and Hats.