Hong Kong has announced an unprecedented ban on all passenger flights from Britain starting from 22 DEC ,

who arrived ahead of the ban would have to undergo an extra week of quarantine.  (14 day + 7 day )

※Cathay Pacific has decided to cancel the following passenger flights from 21 December to 10 January 2021.

https://www.cathaypacific.com/cx/en_HK/prepare-trip/travel-advisories/flights-to-from-the-uk-cancelled-until-10January2021.html