Medieval tours of England, France

One of the summer's more intriguing tours, from the looks of its richly produced brochure, is titled ''The Plantagenet Tour to Medieval England and France.'' In 27 days, you range from the years 793 to 1453, from the Viking raids on Northumberland down to the sieges on Carcasonne during the Hundred Years War. There are tours departing the first day of July, August, and September, each costing $3945 per person. To whet your medieval appetite, write to Elliot House, 1100 South 8th St., Minneapolis, MN 55404 (612) 874-8109.