My father is English and my mother is Thai and I hold a British passport and no other. However, I was born in Thailand and lived there for 8 months till my father managed to get a visa for my mum, since then I've lived in England. I know for the submariners you're not allowed to be dual national. Would I be classed as this? I'm not overly bothered as the fleet was my first choice, however I do find it slightly annoying that I couldn't join submariners even if I wanted to just because my mum happens to be Thai. Thanks.