Twenty years on from the turn-of-the-century vintage, how are its best-loved wines doing from both Left and Right Banks? Jane Anson has picked iconic estates from six top appellations to see how the solar exuberance and rich tannins of 2000 is delivering today; together well taste through Châteaux Issan, Lynch Bages, Léoville Barton, Cos dEstournel, La Conseillante and Clos Fourtet.