© licensed to London News Pictures. LONDON, UK.  10/06/11. Henry Moore's 'Rocking Chair N0. 3' purchased for £150 is expected to fetch £800,000 - 1,200,000. Preview of Sotheby's upcoming Evill/Frost Collection Sale. Highlights from the collection of 20th century British art include an early work by Lucian Freud, bought for £18 in 1944, and now estimated at £400,000 to £600,000, a Henry Moore sculpture of a mother and child in a rocking chair that was designed as a moving toy for his daughter, estimated at £800,000 to £1.2 million and Stanley Spencer's Workmen in the House, estimated at £1.5 £2.5 million. The auctions take place on June 15 and 16.. Photo credit should read Stephen Simpson/LNP