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For the reasons unknown, I only have two official certified copied of my son's Birth Certificate, and no original.

Would they be accepted for his Citizenship Registration, or do I have to double-up on searching for the original (red)?

What if the original is lost?

Thank you in advance.

An official copy ordered from the General Register Office should be acceptable - unless it's what you already have:
https://www.gov.uk/order-copy-birth-dea ... ertificate

Thank you. That's what I have. The copies that were given during the registration ceremony.

I guess, we're safe.