Unabridged birth certificate vs Vault certificate

[leedarwent]

Hi I am applying for my Leave to remain after 5 years in the UK, on an ancestral VISA.

The form requires your birth certificate with parents names.
As I am trying to get this from South Africa where I was born, the option is for either the unabridged certificate or a certified copy of the birth register (vault copy).
Which would be the correct form to send for?

Thank you!!

[CR001]

Surely you have this from when you originally applied for your Ancestry visa?

Either one is fine to apply for, I submitted both.