I understand all about film budgets and how the costs of locations play a large part in getting a film off the ground. That said, I've also spent a great deal of time on Lindisfarne (Holy Island, as it is now called) and I know its history as I've placed a story, a screenplay, and a magazine article there. The Lindisfarne raid by Vikings in 793 was a smash and grab affair sacking whatever riches were in place on the altar of the church. The Vikings' knowing anything about the illuminated book called the Lindisfarne Gospels is far-fetched to say the least and attaching the Vikings' concept of magical significance to that work of art is idiotic.
The opening sequence on the beach at Lindisfarne looks nothing at all like Lindisfarne. In fact, no filmed setting---especially those used by the History Channel for re-enactments or for their Vikings television program---has ever looked like the real Linsdisfarne.
In this film, for the two monks to have escaped the Viking raid on foot to the mainland of Northumberland from the island of Lindisfarne, they would have had to cross a treacherous stretch of mud flats and quicksand at low tide. The same would be true of Vikings following them. It couldn't have and wouldn't have taken place. What's more, the landscape of Northumberland is hardly grey as portrayed in this film but exceedingly green. Even if two monks were seeking refuge for their holy book, they would hardly try to cross the width of Britain to get to Iona but instead head down the coast to Bamburgh, scant miles from Lindisfarne and both a fortress and seat of power during and long before 793. The film's discussion of signal fires having been lit in order to seek the protection of guides for a journey across Britain never would have happened since there was no time for such nonsense because the raid most likely took place at dawn awakening the sleeping monastery.
The whole premise simply doesn't hold in this long-winded draggy mess in which even the local saint being discussed as associated with Northumberland is all wrong. Lindisfarne is strongly associated with Saints Aidan and Cuthbert. It would have been either or both of those who would have been talked about by the film's characters. The writer-director apparently did no homework at all for this project other than to cull the same old historical passages used at the beginning of this film and used ad nauseam (and without understanding) whenever Lindisfarne is mentioned in movies and television programs. The writer-director would have been much better off fictionalizing the places and the whole story, making it all much more visually interesting, and speeding up the storytelling. None of that would have impacted his budget in the least. And what's with that awful horned-helmet artwork on the poster?