Random House UK’s CHA division will start Windmill Books, a literary paperback line drawing from the Heinemann and Hutchinson hardcover programs. Like the Arrow paperback line, the new imprint will be under publishing director Kate Elton, and aims to issue about 20 titles a year, comprising both nonfiction and fiction. Authors already published through CHA’s Vintage and Arrow will stay with their existing imprint. But CHA managing director Susan Sandon calls the new line “a key plank in CHA’s growth strategy.”B2B