Hi Ed
It sounds like I've got the same MI books as yourself, so I should have no trouble finding your Edmundsons.
As your Lawsons aren't in the books, they are probably in the more recent part that hasn't been transcribed yet, so I'll have a look and see if I can see them, I might even spot some more of my own while I'm at it.
After reading the 'acknowledgements' page in the MI books, it sounds as though the registers may be at the archives in Beverley.
I'll be in touch when I've taken the photos
Bee