On a misty morning in the Peak District, Fran O’Dwyer and Bridget Vallance are out for their usual daily walk. They are heading from the close where they both live in Pilsley, Derbyshire, through the village and out for a good stomp in the cold. It would almost be a perfect bucolic winter scene if it weren’t for the cars throwing up bits of gravel and grit from the road as they bomb past, spraying the front windows of houses on the south side of the street. “I bet that’s awful when they drop in