To go to Normandy for me is to go home, not just because we happen to have a house there, but because Normandy reminds me irresistibly of my native Yorkshire. Illogical, say historians; a romantic illusion, declares my husband; but why should the Viking marauders who, in the 9th and 10th centuries, invaded the plains of eastern England and the rich valleys of Normandy, not have left their mark on both? The well-built, rubicund people, countrymen to the toes of their boots, look alike and there are striking similarities in the cooking.