I have some photos from that graveyard I had a nose around a few years back, thanks for the offer.
I had a bit of a dig yesterday and I think we can discount Hannah Herron (mentioned earlier in conversation) as being the Hannah as she married a Thompson Whitfield, not Thomas. It's on familysearch, plus luckily I found one of their children baptismal record on this page :http://durhamrecordsonline.com/updates/2009/page/7/
Thompson is on the 1841 census living in Brancepeth, Durham, I think Hannah had recently died.