ILR Home Office Letter lost

[southamerican]

Hello guys!

I'm planning to apply for naturalisation soon. I have all documents required except the one needed for Section 5, the Home Office letter by which I was given permission to stay here indefinitely, also known as the indefinite leave to remain letter.
I received that letter along with my BRP (which I also lost very recently) but it's now gone.
I was wondering if any of you have successfully applied for naturalisation without said letter or if any of you knows about the possible risks of not submitting it. I am very worried!

Thanks very much.

[Casa]

Have you reported your BRP as lost?

[southamerican]

Have you reported your BRP as lost?

Hello! yes, I reported it a couple of days ago (lost it over the weekend)

[Casa]

It may well be prudent to delay your BC application until you've been issued with a replacement BRP.

https://www.gov.uk/biometric-residence-permits/replace

[southamerican]

It may well be prudent to delay your BC application until you've been issued with a replacement BRP.

https://www.gov.uk/biometric-residence-permits/replace

That was the first thing I was going to do, but I'd have to attach a valid passport if I applied for a BRP replacement. My passport is out of date and it would take a minimum of four months to obtain a new one, which is far longer than the 3 month window I've been given to obtain a BRP replacement not sure what the best thing to do would be