Territory Register

British English-language names and descriptive terms for political, administrative and geographical entities that aren’t recognised as countries by the UK

Registers - Registers are lists of information. Each register is the most
reliable list of its kind. If you wish to know more about registers, please
visit the registers guidance at
https://www.gov.uk/government/publications/registers/registers

Fields in this register - territory, name, official-name, start-date, end-date