you can not give information you do not know Be honest and say you do not know.

Some people never have passports, so just say you do not know as you have lost touch.

Refer to the application guidance notes.

You have to say your nationality. There are about 200 countries and they do not all have the same rules for passports.

no

I doesn't matter if you speak to them or not. You need to fill out something that proves that they were UK citizens or had ILR at the time of your birth.

You fill out all it asks for that you can on the application form

No.If there is any doubt about your entitlement to citizenship, they will ask you for further details.

I don't think so. Neither of my parents had passports when I got mine.

yes