Hi Liam,
I checked the OFHS Marriage Index for any Stephen/Steven with surname 'CR*' and one possibility came up for the parents of your Chester man:
1 June 1744 in Chipping Norton, Stephen CRAWFORD married Sarah PAXFORD.
I don't have the CD of C. Norton PRs, but someone on here will be able to look up the full details. In the meantime, no doubt OFHS will be checking their baptism index for you.
Good luck!
Carol