Entering U.K. with expired passport but valid BRP and valid passport of other nationality

So I am returning from a trip to Germany to the U.K. on September 10, but my Peruvian passport expires on September 7. My biometric residence permit is valid through the next three years, but because my passport is expired will I be refused entry? I am in the process of renewing my passport, but it is impossible to have it ready on time. However, I do have a valid passport under my American nationality. Would it be possible for the officer to stamp that instead or let me in anyway. I cannot cancel this trip, so if anyone has any solutions to helping me figure out solutions that will be very helpful. I plan to use the American passport to register with the airline so it will not be a problem for them to allow me to board my only issue is entering the U.K. again.
Best Answer
Your BRP is evidence of your immigration status in the UK https://www.gov.uk/biometric-residence-permits You will have to show it along with your valid national passport before you begin your return journey, and again when you re-enter the United Kingdom. The permit proves that you are allowed to return to the United Kingdom, but it cannot be used instead of a passport.
Since your US passport is valid, it is sufficient alongside your BRP.
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Can you return to UK with expired passport?
Re: Can I travel back to the UK with an expired Passport? No. If your passport has expired, you don't have a passport, just an entitlement to one.Can I enter the UK with my BRP?
You are advised not to travel outside the UK without your BRP. The BRP is proof of your immigration permission and you are normally required to show this in order to travel to, and re-enter the UK.Can I travel to UK with visa on old passport?
You cannot use a valid visa in your expired passport to prove you have the right to work in the UK. You must replace your visa with a biometric residence permit .Can you apply for indefinite leave to remain in UK with expired passport?
If your passport is lost or stolen or expired, or if you have no proof of your indefinite leave status, you can apply to have your indefinite leave transferred to a BRP by making a no time limit NTL application.6 Month Passport Validity Rule | Can I travel with less than 6 months left on my passport?
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Ethan Wilkinson, Nataliya Vaitkevich, nappy, Nataliya Vaitkevich