It might be worth remembering that due to the complexities of the good old British Empire things were not always straightforward. I met a man (in Africa!) who had been brought up in England, served in the British Army through WW2 and when he came to apply to join the British South Africa Police (in then Rhodesia) was astonished to find that he was not British, but Irish. His father had been in the Army in Ireland before Independence but his grandfather had also been in the British Army and born somewhere abroad. His birth had been registered in Ireland, but no nationality mentioned until he wanted to join the BSAP and found he had never been British because the Britishness was two generations back. Another person born in Kenya suddenly had to become Naturalised British because his father had also been born in Kenya, though of British parents. A third case was an Australian born in British India, taken to Australia as a child by parents who left on Partition, who discovered she was Indian when she wanted to obtain a passport, because both her parents and grandparents had been born in British India. British nationality is something to be approached with caution! Could explain a lot of things.