Ottawa

Michael Aspel takes the experts across the Atlantic to Ottawa for a special edition set in the National Gallery of Canada. Among the finds are a bronze figure obtained in exchange for a pound of coffee, a desk which started life as a musical instrument, a pair of 19th-century 'whirlygigs', wooden bird scarers, rescued from a chicken coop and worth £10,000 and, the real star of the show, a 16th-century emerald jewelled cross which could be worth £25,000.