BA 84 then BA 892 at Heathrow
Vancouver → London → Sofia
Timetable, London time
14:20BA 84 from Vancouver at the gate
14:05BA 892 to Sofia leaves the gate
23 h 45 apart on the timetable, overnight
BA 892 leaves 23 h 45 after BA 84 arrives on the timetable: more than half a day, so not a connection we count.