The walk ends at Lindisfarne and Cuthbert is not there, which is the most interesting fact about the route and the one that gives the last tidal mile its particular quality.
Cuthbert died in 687 on Inner Farne, where he had withdrawn to live as a hermit after an unwilling episcopate, and was buried on Lindisfarne. Eleven years later the community opened the grave, intending to move the bones to a reliquary, and reported finding the body undecayed, which established the cult. The Lindisfarne Gospels were made on the island within a generation, in his honour.
Then came the raids. Lindisfarne was attacked in 793, in what is conventionally treated as the opening of the Viking age in England, and in 875 the community abandoned the island altogether, taking the coffin with them. What followed is unusual: not a flight but a migration, the monks carrying the body and the Gospels around the north of England for seven years, settling at Chester le Street for over a century, moving again, and finally halting in 995 at a defensible loop of the river Wear. Durham exists because that is where they stopped. The cathedral was built over the grave.
The body was translated into the new cathedral in 1104, and the coffin was opened again then and reported still incorrupt. It was opened once more in 1827, when bones, the remains of the carved oak coffin, a small pectoral cross of gold and garnet and other objects were recovered; those are now on display in the cathedral and the cross has become the emblem of the diocese.
So the walker crosses the sands to the place the story began, and the man is eighty miles inland.