In Apsley, near Hemel Hempsted there's an old paper mill that recycles waste paper from surrounding organisations (schools etc.) into high quality paper. They have open days and the place is well worth a visit.
"Frogmore Mill has been making paper for over 200 years – ever since it became the world’s first commercial mechanised paper mill in 1803 – and today still produces speciality papers for commercial customers and the public. "
The Papertrail - Welcome to The Paper Trail
Jim