Do you have problems with a marriage between 1837 and 1911? The civil registration index or the certified copy appears to be wrong? Do you need to find the parish where the marriage took place, or find evidence of a non-conformist marriage?
If you answer yes to any of the above questions you need Bucks Church Finder.
The certified copy of the marriage is only a transcription that could contain errors, why not look at the original actually signed by your ancestors?
Church Finder is the link between two sets of information; the indexes of civil registration of marriages as seen on sites like FreeBMD and the Bucks FHS Marriage Database. The result is a lookup of the church where the marriage took place from the information supplied by the civil registration index - Registration District, Volume, Page, Year and Quarter.
As a member of Bucks FHS and registered on this website you have free access to Bucks Church Finder.