Former prisoners and hostages wrongly held abroad have urged the UK prime minister to urgently secure the release of the pro-democracy campaigner Jimmy Lai before he dies in a Hong Kong jail.
The 77-year-old media mogul, who is a British citizen, has been held in solitary confinement for 1,602 days and his family fears he might not survive another summer in Hong Kong, where temperatures can reach 40C (104F).
