Traveling on BRP after Citizenship Approval

Hi there,
I'm wondering how quickly after citizenship approval does it become invalid to travel on a BRP. I currently have ILR and enter the UK on my BRP. I'm just wondering what happens if I am out of the country on holiday when my citizenship approval letter comes through the post.

Am I alright to travel on the BRP until I go through my citizenship ceremony?

What about the period of time immediately after the ceremony while I apply/wait for a UK passport?

Thanks,

You don't become a British citizen until you are handed the certificate of naturalisation.
No option but to use your current passport and BRP before that happens!

Once a British citizen, technically ILR / BRP becomes invalid (ILR / BRP is issued to migrants, not British citizens). But people do travel unless they lose citizenship of the country that they hold the passport of (and hence the other passport becomes invalid on acquiring BC).