British Nationality could be obtained through your birth, or through the birth of any one of your parents or grandparents, in the Lebanon. This arises because of Britain's relationship with the Lebanon 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 the Lebanon that have been passed over the years.
STATUS OF LEBANON
Up until 31.01.1924, the Crown exercised extra-territorial jurisdiction over Lebanon.
From that date up to the present day, Lebanon is considered a foreign country.