Mechanised paper making started in the Gade Valley, Hemel Hempstead, in the beginning of the 19th century, and continued through virtually all of the 20th century. There is now a Heritage Site called The Paper Trail at Apsley, which has a 100 year old Fourdrinier paper making machine.

General Sources for Paper Making

Paper Mills and Paper Makers in England 1495-1800

Paper Making in the Gade Valley

If you can add to the information given above tell me.