主题：香港人的国籍问题 -- 夜如何其

在其他国家还是提供的

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/352142/Support_for_British_Nationals_Abroad_-_a_guide_2014_FOI_ref_0606-14.pdf

Note 3:

We cannot help British nationals (overseas) of Chinese ethnic

origin in China, Hong Kong and the Macao Special Administrative

Regions. The Chinese authorities consider British nationals

(overseas) of Chinese ethnic origin as Chinese nationals, and we

have no power to get involved in mainland China. However, we can

help British nationals (overseas) living or travelling outside China,

Hong Kong and Macao.