If one wants to look for a bright(er) spot of Cathay's network in April it's probably LHR. Even though it can only take pax one way from HKG it is operating 4-5 weekly at the moment and 3 airlines (including BA and VS) combined have more than 14 flights a week.

Not quite the F demand probably since it's largely students traffic and people leaving HKG for good but that's probably the best performing route at the moment (pax number demands at least).