British passport question

[LadyRenoir]

So I got my longed for British citizenship and a lovely certificate. Now time to apply for the passport and wondering if anyone could help...

I assume I need to send my Polish passport with the application- and the citizenship certificate.

Both my parents and grandparents were born in Poland. Now, do I need to give the details of grandparents' details and date of marriage, if I am not claiming the passport based on their (nonexistent) claim to BC?
Grandparents are long dead and no one in the family even knows when they got married, I could just about get my parents' date of marriage...

[AdInfernos]

Congratulation!

Are you using the paper form?

If you use the online form at https://www.gov.uk/apply-renew-passport it will only ask for the relevant questions to your case. Anyway, just answer "I don't know" when you don't know the answer.

[bruteforce]

You do not need to give your grand parents' details. Only parents' details are fine.

[LadyRenoir]

Thanks!
I am doing the paper version. Rang the Passport infoline and they did not know, which was a bit confusing.
Not sure how my grandparents were relevant to an application, good I don't need to include the details