So farewell, Hong Kong. The vibrant, pulsating city-state that grew, under British rule, into one of the world’s great financial, business, cultural and tourism hubs has finally been brought to heel. Browbeaten, abused, silenced. Trust Xi Jinping, China’s dementor president, to suck out all the joy. Last Wednesday was the UN’s International Day of Happiness. But it was a sad, bad day for Hong Kong.

That was the moment residents woke up to the news that Hong Kong’s puppet legislature, acting on Beijing’s orders, had unanimously abolished its right to think, speak and act freely. Eating noodles is a seditious act now, if the noodles have secret foreign connections. Under new security laws, known as article 23, life imprisonment awaits those who defy the behemoth to the north.

Commending the laws, John Lee, Hong Kong’s placeman chief executive – whose approval rating is at a record low – hit new highs of paranoia. The measures would “allow Hong Kong to put a stop to espionage activities, the conspiracies and traps of intelligence units and the infiltration … of enemy forces”. Translated, this means locking up ordinary people who dare to speak their minds. Unhappily, most no longer do.

Article 23 is final confirmation of China’s shocking breach of faith with Britain. Beijing solemnly pledged, 40 years ago, to respect Hong Kong’s autonomy. The 1984 Sino-British joint declaration agreed the “one country, two systems” principle would continue in force for at least 50 years after the 1997 handover. China gave........

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