Not been round there for many years but is the area in question, on St. Johns Road and just below Avenue Road? If so, then it was a Chesterfield borough council yard for highways and sub depot for works dept. The managers house and garden was just inside the entrance on the right and the narrow buildings were stores, workshops and sheds for lorries etc. The grass area at the rear of the workshops (on Avenue Road) has , or did have, air raid shelters there. Sorry if i,m in the wrong place!