Great Britain
We have revamped our Administrative Area field so that we consistently return the Administrative County value as defined by RoyalMail. Note that the county value is not used in the mailing address and is not in the mail PAF (Postal Address File) dataset provided by RoyalMail to their partners.
Not all addresses have a Administrative County specified by Royal Mail, so we will occasionally fall down to the Traditional County or the Formal Postal County if the Administrative County is not available.
Along side the Administrative Area, we have cleaned up the CountrySubdivisionCode, which will always return a value that maps to the Administrative County.