Cathay Pacific already last week canceled their flights from the UK to Hong Kong for 2 weeks due to the new strain of the Coronavirus, and Hong Kong Governments ban on anyone who have been in the UK for more than 2 hours in the last 3 weeks to enter Hong Kong.
Flights from Hong Kong to London will resume on January 12, with about 5 flights per week until January 24th. The crew on those flights will continue onto Amsterdam after their leg to the UK, to avoid them entering the country and also being subject to the ban.
Virgin Atlantic has canceled their flights until January 31st, whereas British Airways already operate passenger flights from Hong Kong to London, but they only carry cargo in the other direction. It is unclear until when British Airways plan to cancel passenger flights to Hong Kong.