Hi Jonathan
It is my understanding there is no "certif." as such - simply the image of the parish record.
It is relatively inexpensive to order the film from your LDS Centre to look at same. You could then check the transcription. You are unlikely, however to find much more information on the marriage. On rare occasions the grooms occupation and or details of the wife's father may appear (although the latter is usually transcribed in the IGI index). If, however the index is incorrectly transcribed, you may well have another name for further searching.
You also have the complete film to search, so if you have other family members in the same parish in the timeframe of the film, you may find more family records.
Trish
