Sotheby's 20th C British Art = £8.4m December 15, 2010 by Marion Maneker More from Art Market MonitorSotheby’s Mod & Postwar British = £9.4m ($11.8)Christie’s Modern British = £9.8mLowry-palooza Makes £26.3mSotheby's 20th C British = £4.58mStanley Spencer Sets a RecordHigh Prices, Low Returns