Hi,
I looked this up at the Beverley RO this morning, but not too much extra info to go on, I'm afraid.
St Marys, Beverley 25 Dec 1829 John Duffill of this parish, bachelor & Mary Duncum (I'll bow to the IGI here, but it was such a scrawly handwriting that it could have have been anything beginning with a D and the rest being small letters running into the line they were written on: I'd have said Duncan!). She was a spinster of this parish. They married by banns: The signed, she made her mark. he witnesses were: John Burton, Sarah Jacks and one illegible one who I don't think was a Duffill or a Duncum/Duncan.
I hope that helps.
Jill