Bain Capital has agreed to sell UK payroll software company Zellis Group, whose clients include department store Harrods and carmaker Jaguar, to Apax Partners, according to a statement.The deal values Zellis at about £1.25 billion ($1.56 billion), according to people familiar with the matter. Apax is partly funding the deal with a unitranche loan of £450 million from private credit funds, the people said, asking not to be identified discussing confidential information....