Naturalisation certificate

[LadyEloise1]

How do I order a Naturalisation Certificate from the GRO office please ?
I can't see anything re Naturalisation Certificates on the website. I am searching for dh's great great great grandfather
It was late 1800s, and I have the cert number and exact year but nowhere to enter it to apply
It has not been digitalised and I know I won't be visiting Kew anytime soon, sadly, because of Covid.
Thank you

Anyone ?

Are you sure it's held at the GRO? They generally just do births, marriages and deaths, along with related things like adoptions or stillbirths.

www.nationalarchives.gov.uk/help-with-your-research/research-guides/naturalisation-british-citizenship/

Seems to suggest they are available on Ancestry, scroll down to Section 8, or you can order online from the National Archives. I have an Ancestry subscription and am happy to look for you if you want me to look.