There is of course a place for optional keywords and entering the date did have the effect of reducing the search field.
I also tried a search via the 'Life Events' BMD search methodology. Interestingly this offered First Name/Last Name sequence and not the reverse as I encountered in my previous search. (Certainly inconsistency). It also invited an entry for birth and death years; but no marriage year and of course I did not have county detail. So I entered just her name and her marriage year in the Optional keywords box and asked it to search.
It accomplished the search reasonably quickly but, of course, included ALL instances of Jane Pritchards' either born, married or who had died in 1853. I can only assume the correct Jane Pritchard was shown as there was at least one who married in 1853.