The Guardian carried an article on Saturday 12th January, 2008, indicating that the Pontcysyllte Aqueduct (Telford's Bridge in John Warner's great song above) is to be assessed for possible designation as a World Heritage Site. The item hasn't appeared on Guardian Online yet, but I did find this which has a couple of great aerial photographs and refers to other sites with more info:-

GrannyButtons

Ron Baxter of Fleetwood worked on a set of canal songs with Nick Dow some years ago. I'll try to find out more about them for possible inclusion here.