The current LHR offering has a daily CAN-LHR on the B789 with an additional :
CZ 651 18:15 CAN SYX LHR T4 Thu Sun
CZ 653 18:25 CGO LHR T4 Tue Sat
CZ 673 18:30 WUH LHR T4 Mon Wed Fri
So given a daily PKX-LHR A380 is being offered for summer 2020, is the remainder of the non CAN flights as per above moving over to LGW as well?