British Nationality could be obtained through your birth, or through the birth of any one of your parents or grandparents, in the Gambia. This arises because of Britain's relationship with Gambia and its 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 Gambia that were passed over the years.
STATUS OF GAMBIA
Prior to Independence, the Gambia was made up of two territories. From Independence on 18.02.1965 until the present day, the Gambia is an independent Commonwealth country.
From 1783 to 31.12.1948, the Gambia Colony fell within the Crown's Dominions. Between 01.01.1949 and 17.02.1965, it fell within the UK and Colonies.
Click here for more information on the status of Citizen of the United Kingdom & Colonies (CUKC), a status achieved by birth in the Colony.
From 1880 to 17.02.1965, it was a British Protectorate.
Click here for more information on the status of a British Protected Person (based on birth in a British Protectorate).
For more information on how British Nationality could be gained through your birth (or a parent's birth) in a British Protectorate coupled with a UK-born grandparent, watch this short video by Philip Gamble: