中英聯合聲明
During the Sino-British negotiations over the future of Hong Kong and the drafting of the Sino-British Joint Declaration in December 1984, Lee joined the delegation of Office of the Unofficial Members of the Executive and Legislative Councils (UMELCO) to meet with the British politicians in London and raised concerns about the Joint Declaration. The UMELCO also attempted to mobilise public opinion on the terms of the Sino-British agreement and made known Hong Kong's views to both the British and Chinese governments. Legislative Council member Roger Lobo moved a motion to demand a debate in the Legislative Council on the draft of Sino-British Joint Declaration in February 1984. It was backed by Allen Lee.