First passport documents required

Hello

I'm applying for my first UK passport after ceremony

Documents they require

1) The passport you used to enter the UK

2) any uncancelled foreign passport


Are they asking me to send 2 passports here ? My current valid foreign passport which I have

And also the passport I used to enter the UK 17 years ago? Because I doubt I have it and surely expired

Advice would be appreciated

Thanks

Just send your current valid passport and Naturalisation certificate.