OCI with only grandparents British Death Certificate

[k4pz]

Hi all,

I am born in United Kingdom, my mother was born in Tanzania and my father was born in Kenya. My fathers father (my grandfather) was born in Porbandar, Gujarat, India and moved to Kenya then later to UK. Sadly he passed in the early 90's

I am trying to apply for OCI card based on my Grandfathers Indian Origin, but I have no documents to prove he was born in India. I have my own birth certificate my parents birth certificates and marriage certificate, however nothing official to say my Grandfather was born in India. The only thing I have got is a British Death certificate for my grandfather to say he was born in India.

What can i do to make me eligible for OCI? Are there archives or agencies in India that can help?
I've been reading up about notary and nativity certificates but all so confusing.

Finally does anyone know of an agency that will complete the entire process for me given the fact I have no documents?

Kind regards