Lord Patten: Were promises to Hong Kong broken?

When the UK handed Hong Kong back to China 25 years ago, the last words of the departing British Governor to the people of the territory were: “Now Hong Kong people are to run Hong Kong. That is the promise. And that is the unshakeable destiny.” Sarah Montague speaks to Lord Patten, the man who made that pledge, to ask if that promise has been broken - and if the UK could have done more to honour it.