Once a UPRN has been added to case then all associated Cross References can also be added.
The source of those Cross References can be selected from a drop down menu and all information entered will be saved within the LLPG.
Do you have a question about Street Naming & Numbering?
The Law of Street Naming and Numbering
Introduction to BS7666
BS7666 for Developers
Using AddressBase Premium
Integrating AddressBase into your systems