The RGC is a 'light' but key document that contains information to manage the allocation of new codes in cooperation with the entity owners. It includes details of each entity code, name and owner, the range of instance codes and number of live and archived instances. The document should be used in conjunction with the Code History Database.
The RGC is available in MS Excel format within a zip file, that also contains XML metadata and a product specification document.
The current file can be downloaded free of charge from the Open Geography Portal.