The U.K.-based Diageo plc, which planned to launch the open offer to buy up to 26 per cent additional stake in United Spirits from January 7, has been postponed. A notification to stock exchanges from JM Financial Institutional Securities has stated that it was awaiting the final observations from the Securities and Exchange Board of India and the revised schedule of activities would be intimated in due course. United Spirits had earlier said that the open offer would commence on January 7 and close on January 18.