I agree with Joebloggs, our daughter was born October'2006 and we had no problem getting her a British passport, all we needed was my name on the NSO birth certificate, it was really easy, we got her British passport and British birth certificate within a week of applying. As for not being sure if the child is yours or not, most mixed babies have quite white conflections, we have experienced a guy paying all the hospital bills for the delivery of a child that was pure Filipino $$$$!