We (a couple) secured a last minute room at the Manor House which is located very conveniently to visit Lindisfarne (Holy Island) and to visit the beautiful Northumberland beaches. We were made very welcome and the hosts booked us for dinner at a nearby (3 miles down the road) pub which does a great beef and ale pie. The beer is good too. We enjoyed our stay and would recommend them to any future visitor.
Note that this is a rural B&B. There is nothing much else in Fenwick, just a small village with no services.