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Hunts Marriage Index has no such marriage under San(d)ford or Sawford, although there were three times as many Sanford burials in Hunts than Sawford, so San(d)ford looks to be the more likely.
In 1841 Mary gives her birthplace as Hunts, for what it's worth.
If you're desperate (which you obviously are!) you might consider looking a bit closer at a marriage in Brampton in 1780 between Thomas Sandifer and Mary Tibit, although Mary would have been rather on the young side. And there's a Mary widow who married in 1799, so it may not have been the right couple
The entry for Thomas' burial in Abbotsley states he died from "an apoplectic fit"
Good luck
David