[jameshh]

> I think the author may also be born outside the UK which may require other/more documents

In fact `applicant's father` (me) was born in the UK in this case, but `applicant's father's father` was not, the cause of the extra complications.

[crooked-v]

I have to wonder how they would handle cases where a person doesn't have a legal father at all.

[lmm]

If you don't have a legal father then you can't claim British citizenship through your father. That's all pretty straightforward. (Although there's a fun case where you can claim citizenship by double descent because your ancestor wasn't able to claim citizenship because of sexist historical laws).

[new299]

:(

Weirdly this never came up for me (and I'm in a similar situation). I suspect what documents are ask for varies a lot by who is assessing the application.

Hope it all works out!