British Nationality could be obtained through your birth, or through the birth of any one of your parents or grandparents, in Palestine. This arises because of Britain's relationship with Palestine 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 governing Palestine that have been passed over the years.
STATUS OF PALESTINE
Up until 28.09.1923, the Crown exercised extra-territorial jurisdiction over the Palestine (which included what is now Israel).
On the 29.09.1923, Palestine became a British Mandated Territory. Both the mandate and the jurisdiction ended when the State of Israel was established on 15 May 1948.
From that day and up to the present, Israel is considered as a foreign country.
As “Transjordan”, Jordan was originally a part of Palestine. Therefore, up until 28.09.1923, the Crown exercised extra-territorial jurisdiction in the country.
Between 29.09.1923 and 17.06.1946, Jordan was a British Mandated Territory.
From 18.06.1946 and up to the present day, Jordan was a foreign country.