Am I allowed to travel outside the UK while I'm waiting for a response? My BRP expires at the end of January :-/
Unfortunately not.
As long as you remain in the UK, your immigration status will be automatically extended under Section 3C Leave while your visa is processing, even if the BRP expires in that time
However, as soon as you leave the UK, your ILR application will be invalidated, and your Section 3C Leave will cease - which means that if your BRP expired while you are abroad, you would not be able to return to the UK again, as you would no longer have a valid visa and no immigration status protection… therefore you would have to start the entire 5-year spousal visa process over again from your home country in order to move back to the UK.
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