There are 39 reviews, from people who've stayed there, on this site:
http://www.tripadvisor.com/Hotel_Review-g18634 5-d209997-Reviews-White_Horse_and_Griffin-Whit by_North_Yorkshire_England.html
(Although that site reviews the White Horse & Griffin as a hotel, many of the reviewers give their views on the restaurant).
The Daily Telegraph reviewer liked it 16 months ago:
http://www.telegraph.co.uk/travel/main.jhtml?x ml=/travel/2006/02/11/etroomservice11.xml
The problem with considering the quality of restaurants over the Christmas period is that many places let their standards slip during the festive season. I've been to places which serve superb food, at reasonable prices, throughout most of the year but at Christmas they've turned out the same basic meals as a Beefeater or Brewer's Fayre restaurant, at three or four times the price. (Hotels and restaurants often employ temporary agency staff over Christmas, even to fill senior positions. Many of them have no real interest in producing quality food or quality service.
Chris