Yes, that's the marriage but my Samuel married Mary Dawborn, not Mary Arnold. Unfortunately for me, they married in 1828 before civil registration so I've no clue who his parents are, hence the quest for his baptism.
Looking at the Woburn PRs there are a fair number of Norman events up to 1785 and then nothing. I wonder if a chapel or some other religious group came into the area and the Normans joined them. They didn't pop up in a search of non-conformist registers on Ancestry but I haven't given up.