Hello, I need to see an original entry for a marriage at St Matthew, Exeter, on 16 May 1921. I have the GRO copy with the details, but I need to compare a witness's signature and spelling. I'm not sure whether this is a service I can pay for from here, or do I have to apply to the Heritage Centre? Please could someone kindly advise me? Thank you very much in advance. (I'm a brand new member in Australia and not quite sure how it works)