If you are investigating the Buy product acquiring the country_id of GB, nonetheless you'll need Uk, the subsequent code might be made use of, merely a fast snippet of code that could return you the Region Title dependent on the region code, e.g:
Code:
Mage: :software()->getLocale()->getCountryTranslation($country_id);
Only go as part of your state id price (e.g GB) and Magento will return the complete place identify.