Spring Line, in Northampton, has estimated King Charles, the belatedly Queen, and Idris Elba among its clients.Found in 1982, many Northamptonshire shoemakers use its products.Sales director, Michael James, said: “I am seeking to leave Spring Line in a healthy place.”Lasts – a word from the old English latest meaning footprint – are molds made approximately in the form of a human foot used by...