If you'd settle for something faintly Carolingian (not sure exactly what look you're after) as discussed above, there's a free font called "Kelt" available at this site that might do the trick and, unlike many free fonts, has a full character set. "Goudy medieval" is also there; if you're looking for readable that's a good bet, but of course it's quite akin to modern typefaces.

There are lots of other fonts there too (though unfortunately all of the links marked "new" seem not to work). I've just downloaded a few more fonts and am about to unzip them so I can see what I've got. (Doing this at work, I can only get away with a few a day.) I'll get back to you if I see anything Lindisfarne Gospels-ish.

Claire