Dear Adrian,
I have a popular name too...........Roberts!
Do not be put off with your Smith, you have done well to find a birth date and apply for the certificate.

It is only when you receive the certificate, you will find out your Grandfathers name and trade, your Grandmothers maiden name and of course the address where they lived at your fathers birth.
This will be the start of your research.
Once you have the information, please feel free to ask for any help you may need.

Regards
Sarah
Admin