Dataset - data.gov.uk

NUTS Levels 1 to 3 (January 2012) Map in GB

A PDF map that shows the Nomenclature of Territorial Units for Statistics (NUTS) Levels 1, 2, and 3 in England and Wales as at January 2012 and in Scotland as at December 2008....
- HTML

You can also access this registry using the API (see API Docs).