Last month, Sotheby’s said that it would offer the most valuable collection of art ever to come to auction in the United Kingdom this coming June in London: 50 lots from the storied collection of the billionaire businessman Joe Lewis . Over the past four decades, Lewis assembled a collection of figurative painting that includes examples by Gustav Klimt , Amedeo Modigliani , Francis Bacon , and Leon Kossoff , which will all come to the block during an evening sale on June 24 and a day sale on June 25. Now a 51st lot will join them: Lucian Freud ’s Sleeping by the Lion Carpet (1995–96), which heads to auction for the first time with an estimate of £25 million to £35 million ($34 million to $47 million), pushing the collection’s total estimate north of £150 million ($202 million). The unflinching and imposing piece is the last of four canvases Freud painted in the mid-1990s of Sue Tilley , a London job center worker, that forms part of his “Benefits Supervisor” series.…