The UK has set itself on a collision course with China after broadening its offer on extended visa rights from 350,000 to almost 3m Hong Kong residents. After Beijing announced plans this week to proceed with the imposition of a national security law on Hong Kong, UK foreign secretary Dominic Raab retaliated with an “unprecedented” pledge to expand visa rights for British National (Overseas) passport holders in Hong Kong from six to 12 months and “provide a pathway to future citizenship”.

About 350,000 people hold valid BNO passports, a document issued to Hong Kong residents born before the handover of the territory from UK to Chinese sovereignty in 1997. However, the Home Office clarified on Friday that the pledge to extend visa rights would apply to anyone eligible to apply for a BNO passport currently living in Hong Kong, of which there are estimated to be about 2.9m. Most of the additional 2.55m people have held a BNO passport in the past but not renewed it.

The move was made because “the new security law will undermine the existing legal commitments to protect the rights of Hong Kong people”, the Home Office said. It is symbolic of the UK prime minister Boris Johnson’s new willingness to adopt a tougher stance towards Beijing.

With increasing concerns that Beijing did not disclose the initial scale of the coronavirus outbreak, Mr Johnson is under pressure from his own backbench MPs to reset relations with Beijing.

Priti Patel, UK Home Secretary, said on Friday night: “I am deeply concerned at China’s proposals for legislation related to national security in Hong Kong. “If China imposes this law, we will explore options to allow British Nationals Overseas to apply for leave to stay in the UK, including a path to citizenship.

“We will continue to defend the rights and freedoms of the people of Hong Kong.”