My April flight to Manchester has changed to reflect the longer flying time.

April 2 & 19, 2022
CX 219 HKG-MAN still departs at 1:15am but will now arrive Manchester at 8:45am.
Flying time will be fourteen hours and thirty minutes, which are two hours longer than previous.

London flights will depart earlier now and I presume it has to do with slot.
CX 251 will depart now at 11pm and arrive in London Heathrow at 5:40am.
Flying time is thirteen hours and forty minutes.

Carfield