Hi Donna,
No, I don't know which Mary Caine Thomas married. However, I do have the full details from the marriage register, noted down with pen and paper at the time.
They are married by licence (no banns), it specifically says they are each of this parish ie. Andreas, Mary Cain makes her mark -she can't write and the witnesses are down as Thomas Harrison and William Corkhill.
Do you have any Corkhills attached to either of the possible Cain families - a female Cain married to a Corkhill perhaps - who is a possible for this William ?