The UK could offer British National (Overseas) passport holders in Hong Kong a path to UK citizenship if China does not suspend plans for a security law in the territory, UK Foreign Secretary Dominic Raab says.
There are 300,000 BNO passport holders in Hong Kong.
They have the right to visit the UK for up to six months without a visa.
Mr Raab’s statement came after the UK, US, Australia and Canada issued joint condemnation of Beijing’s plan.
The proposed law has been backed by China’s parliament – which endorses decisions made by the ruling Communist Party – and could be in force as early as the end of June. It would make it a crime to undermine Beijing’s authority in Hong Kong.
The four nations said imposing the security law would undermine the “one country, two systems” framework agreed before Hong Kong was handed over from British to Chinese rule in 1997.
It guaranteed Hong Kong some autonomy and afforded rights and freedoms that do not exist in mainland China.
China has rejected foreign criticism of the plan.
Li Zhanshu, chairman of the parliamentary committee that will now draft the law, said it was “in line with the fundamental interests of all Chinese people, including Hong Kong compatriots”.
British National (Overseas) passports were issued to people in Hong Kong by the UK before the transfer of the territory to Chinese sovereignty in 1997.
Announcing the possible change in policy, Mr Raab said the six-month limit on stays in the UK for BNO holders would be scrapped.
“If China continues down this path and implements this national security legislation, we will remove that six month limit and allow those BNO passport holders to come to the UK and to apply to work and study for extendable periods of 12 months and that will itself provide a pathway to future citizenship,” he said.
The BBC’s diplomatic correspondent James Landale says that in Beijing the threat will be seen as an escalation and is likely to prompt a robust response.
China might not mind if some pro-democracy campaigners escape to the UK but the flight of talented wealth creators would be of concern, our correspondent says.
Some MPs want the UK to go further and offer automatic citizenship. Conservative MP Tom Tugendhat, chairman of the foreign affairs select committee, said BNO holders should have an automatic right to live and work in the UK.
The government has in the past rejected calls to give BNO holders in Hong Kong full citizenship.
Last year more than 100,000 people in Hong Kong signed a petition calling for full rights. The government responded by saying that only UK citizens and certain Commonwealth citizens had the right of abode in the UK and cited a 2007 review which said giving BNO holders full citizenship would be a breach of the agreement under which the UK handed Hong Kong back to China.
However in 1972 the UK offered asylum to some 30,000 Ugandan Asians with British Overseas passports after the then-military ruler Idi Amin ordered about 60,000 Asians to leave. At the time some MPs said India should take responsibility for the refugees, but Prime Minister Edward Heath said the UK had a duty to accept them.__BBC