I have received an email reply to my request to confirm or deny the parents of Caroline Hamlin. I did as suggested and put all I knew.
The names of bride and groom, exact date of marriage and even named South Street Baptist Chapel as where the marriage took place. Plus the names of Caroline's parents.
Maybe I was pushing my luck but I also asked if they would confirm or deny whether or not both birth registrations for Caroline had the same named parents.
I quote from the very prompt email reply below.
"We are unable to help with family history research at the Devon Register Office, we provide copies of Birth, Death and Marriage certificates for a fee if the customer is able to provide detailed information names, dates and place the event happened."
No luck at all! It looks like I have to send for the marriage certificate after all. I will leave ordering two birth certificates for now as I am content to know that Caroline was born in the Sept quarter. The marriage is the key certificate to establish if I have the correct Caroline and continue the family tree.