Sorry for my very late arrival on this site, but I have only just come across it!
Also apologies for being a bit of a novice in these matters.
I have John & Martha on my family tree but their marriage date does not ring true with the births of one or two of their eldest children unless they are from a previous marriage. I am more than happy to share any information that I have and may I recommend(unless you are familiar with it) Malcolm Bull's Calderdale Companion which I visit regularly. I have also a photo of the gravestone of Martha, John, and one or two more which I think are more likely to be the ones you are looking for