CX 255 then BA 1346 at Heathrow
Hong Kong → London → Saint Helier
Timetable, London time
06:50CX 255 from Hong Kong at the gate
06:15BA 1346 to Saint Helier leaves the gate
23 h 25 apart on the timetable, overnight
BA 1346 leaves 23 h 25 after CX 255 arrives on the timetable: more than half a day, so not a connection we count.