Historic England Registered Parks & Gardens
Historic England (formerly English Heritage) maintains a "Register of Parks and Gardens of special historic interest in England" that includes private grounds, public parks, cemeteries, town squares, educational and institutional grounds.
Within Avon there are 39 Parks and Gardens on Historic England's Heritage List. Place names are linked to their listings on the registry. Where featured on a local council site they are also linked in the Area/Council column.