Hi again, I'm wondering if you know about this, Chris :
Scroll down the page on the link below :
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https://familysearch.org/ v
United Kingdom and Ireland
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England, Diocese of Durham Bishops' Transcripts ca., 1700-1900
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Browse Images
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Browse through 106,351 images
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York
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Osmotherley
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Please forgive the idiots guide, but I only found the Osmotherley Transcripts about a fortnight ago. I'd never have thought to click on the York link when there's also one for Yorkshire. As far as I can see the pages you need for the births might not be there - but you will find the marriage I quoted earlier. Not all the earlier pages are in the right order, so you'll have to be patient.
Pels.