My father was born in the UK. I meet all of the requirements for British citizenship by descent. However, I cannot find my father's birth certificate in the GRO registration book. I can find his sibling's birth certificates as well as my grandparents' birth certificates. I also have a photocopy of the UK 1910 census showing him as a member of my grandfather's family. Can I apply for citizenship by descent with this evidence even though I cannot provide his birth certificate?