The library does have transcripts in book form for the Parish Registers (St Cuthbert's). They go up to July 1837 which is when civil registration was introduced, so you would be able to look up the marriage as it was before this date - what you can't do is get a marriage certificate. Lots of entries for this period give the ages of the bride and groom which would give you a rough idea of when to look for a baptism.
Alternatively our Society members who live locally can borrow microfiche copies of the registers plus a fiche reader from our own Society library. These fiches go up to 1920 for some of the registers.
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Middle-aged and seeking the middle-ages!