A4440 construction, Ah! Worcester South The Countryside Landscape and structures, thanks interesting description. A few of those over the years. Minor agricultural processing with soft soil eroding cutters and graders, no wonder our motorways subside and flood yield sediments and congest varied cheap narrow conduit, reducing capacity. That you may refer to as Shoaling up southern English Wales Severn catchment of the Afon Hafren high water throughflow 1968 to 2008, all over Swindon
M25 Dunstable I have a picture. Best wishes Mike November 2012