The UK the government has published details of the method for British National (Overseas) (BN(O)) citizens ordinarily resident in Hong Kong, and their immediate family members, to move to the UK to work and study. Please find this at the link here: https://www.gov.uk/guidance/british-nationals-overseas-in-hong-kong
This is the press release from the Home Secretary: https://www.gov.uk/government/news/home-secretary-announces-details-of-the-hong-kong-bno-visa