Given that you have a US passport you are quite lucky. Just use your US passport at the e-Gate as all UK residents whose nationality allows them to use the e-Gate will be admitted as residents (not as visitors). Your BRP is not needed to enter the UK See: https://www.immigrationboards.com/general ...

Hi, I'm a US citizen living in the UK with my (UK citizen) husband. I have an ILR and have been living here for over 12 years. We've been trying to get back to the States to visit my elderly mom since ... well... 2020. Finally scraped together enough funds post-Covid to get airline tickets. All our ...