Sir Keir Starmer has met President Xi Jinping at the G20 summit in Brazil emphasising the importance of a "strong UK-China relationship" for both countries.
The meeting was the first time a UK prime minister has met the Chinese president in person since 2018, following a recent souring in relations.
Sir Keir raised the case of the detained Hong Kong pro-democracy activist, Jimmy Lai, saying he was concerned about reports of a "deterioration" in his health.
The PM also signalled a desire for greater business co-operation, particularly on "areas of mutual cooperation" such as international stability, climate change and economic growth.