Market is alive and kicking at the top for prime Impressionist works, though Bouguereau's uncomfortably placed, 19th-century Bacchanalian scene failed to sell

Fresh material from big collections led the $399m New York auction, while mid-tier Monets primed the market for his $55m haystacks work at Sotheby's tonight

Owned by a British collector for almost 70 years, the work showing Charing Cross Bridge has gone abroad