On 31 January, the Home Office published the results of a survey on Hong Kong British National (Overseas) visa holders living in the UK (Home Office); this data is available at a UK level.
Ar 31 Ionawr, cyhoeddodd y Swyddfa Gartref ganlyniadau arolwg ar ddeiliaid fisa Cenedlaethol Prydeinig (Tramor) Hong Kong sy'n byw yn y DU (Swyddfa Gartref).