There are currently just six dairies licensed to make Stilton (three in Leicestershire, two in Nottinghamshire and one in Derbyshire), each being subject to regular audit by an independent inspection agency accredited to European Standard EN 45011.
Oba sira sta zaščitena s strani Evropske komisije, pod tem imenom pa ju lahko izdelujejo samo v treh angleških grofijah; Derbyshire, Leicestershire in Nottinghamshire.