BA 1401 then BA 85 at Heathrow
Belfast City → London → Vancouver
Timetable, London time
18:25BA 1401 from Belfast City at the gate
17:05BA 85 to Vancouver leaves the gate
22 h 40 apart on the timetable, overnight
BA 85 leaves 22 h 40 after BA 1401 arrives on the timetable: more than half a day, so not a connection we count.