China's President has insisted that the "one country, two systems" arrangement in Hong Kong is working.

Xi Jinping has been leading events marking 25 years since Britain handed the city back to Beijing.

But critics say the system has been fundamentally undermined by China's national security law , which has led to the arrest of countless pro-democracy campaigners.

Lord Patten, the UK's last governor of Hong Kong, back in 1997 speaks to Sky's Mark Austin.

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