British Nationality could be obtained through your birth, or through the birth of any one of your parents or grandparents, in Gibralter. This arises because of Britain's relationship with Gibralter and Britain's Colonial history.
To determine what form of British Nationality you might have, an analysis of your family's history must be done, and then applying it to the Nationality laws of Gibralter that have been passed over the years.
STATUS OF GIBRALTER
From 1713 up to 31.12.1948, Gibralter fell within the Crown’s Dominions. From 01.01.1949 until 31.12.1982, they fell within the UK and Colonies. From 01.01.1983 until the present day, it was a British Dependent Territory.
Spain has had a long-standing dispute with the UK over sovereignty and claim Gibralter is part of Spain.
Click here for more information on the status of Citizen of the United Kingdom & Colonies (CUKC), a status achieved by birth in the Colony.