The discussion ended in an agreement that formally seals the future of Hong Kong, transferring it from a British colony of six million people back to China in 1997.
The agreement, which ended 155 years of British rule of the colony, also launches a new era in trade and diplomacy between the two countries. Britain secured at least fifty years of semi-autonomous status of the colony, with promises to maintain the capitalist system. Many other rights of the citizens of Hong Kong were to be maintained after the hand-over.
To the left of Mrs Thatcher is the Foreign and Commonwealth Secretary Sir Geoffrey Howe.