You can find information on International Territorial Levels (ITLs) in 'A Beginner's Guide to UK Geography' section of the website and you can download the files from the Open Geography portal.
We provide names and codes files in CSV and MS Excel. CSV files can be read in MS Excel and all common database applications.
To distinguish the replacement UK classification from its EU predecessor, the UK-managed classification is referred to as International Territorial Levels (ITLs) and adopts a convention used by the Organisation for Economic Co-operation and Development (OECD) member countries. These ITLs therefore align with international standards, enabling comparability internationally.
You can download the files from the Open Geography portal.