United Kingdom - Passport & Nationality - British Citizenship by Double Descent (Upgradable BOC)
A solution exists for a person born between 1949 and 1983 to a father born before 01.01.1949 in a place that remained a British Protectorate on 01.01.1949. In addition, their paternal grandfather must have been born in a place that was within the British Crown Dominions on 31.12.1948. Such a set of circumstances results in a British Overseas Citizenship claim. If the candidate has a UK-born Grandparent that results in them having the Right of Abode, then this can be upgraded to full British Nationality.
Candidates must not have been subject to the automatic loss arrangements specific to the countries involved to qualify under this provision.
Click here for more information on the British Overseas Citizen (BOC) status.