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Hi, I know we send naturalisation certificate and uncanceled passports for 1st British passport but do we also send BRP cards? Also, do we need naturalisation certificate when renewing british passport?

Thank you

BRP not required - they are invalidated by becoming British.
I believe you don't need to provide your certificate when renewing a passport, but check at the time.
However, whatever the requirements, keep the certificate safe, it's the only proof conferring British citizenship.

And do NOT laminate your naturalisation certificate ever.

Also, you are required to return your brp card to UKVI within 5 days after your ceremony.

Ok great thank you for all the replies and advice