how to inform the employer of my British passport

[Kamilla]

Hello!
I recently have become a British citizen and have received my new passport. The first passport was not EU.
Do I have to provide the new passport details to my employer, please? Is there a time limit?
The HR department pretty much ignore my questions about it. I want to make sure I am not breaking the law by them not having my new passport details.

[CR001]

Not required to update them. Presumably you did update the employer of your ILR.

[Kamilla]

Thank you very much! Yes, i did.