It's a case of emination really, not every church was allowed to perform marriages, most villages used the parish church for the marriages and marriages tended to take place in the brides home parish. Every registration district held a register for every place that could marry and that is where the registrar recorded the marriage as well as the church/chapel register. The reference you have is from the civil register but the registrar would have recognised the volume number as belonging to a partocular parish and the registrar now will know that info too but is unlikely to part with the info! Anyway, look at GENUKI for the village/town converned and it will list every ploace a marriage could legally have taken place between certain dates,