Get GRO Index Reference Number for birth on foreign army base

[newtimesearcher]

I am trying to apply for a birth certificate for somebody who was born on an army base in 1952. I have found their entry in the Gro Army Birth Indices (1881 To 1965) dataset on findmypast.co.uk which has given me the following information..



Can anyone tell me how I generate the GRO index reference number for that entry?

Is the page number in brackets actually the volume number?

Hope somebody can help!

 

[barbarajoh]

https://www.nationalarchives.gov.uk...rch-guides/birth-marriage-death-armed-forces/

I wasn't sure myself but think you have to apply to the National Archives, link above.