Biometric Residence permit and Renewal of Passport

[akashths]

Hi,
I have a valid biometric residence permit, and have recently renewed my Indian Passport.
I was wondering if I need to inform of my new passport number to UKBA or does it needs changing onto BRP (which as per UKBA does not seems to be case- only change of name, sex, nationality and residence change more than 6 mnths need to be informed.)
I was not able to find any further information on UKBA or elsewhere. So simply the question is,
1. does the renewed passport needs to be notified to UKBA
2. Do I need to carry both old and new passport for travel

Thanks in advance for the inputs.

Suresh