BA 349 then BA 792 at Heathrow
Nice → London → Göteborg
Timetable, London time
21:05BA 349 from Nice at the gate
12:55BA 792 to Göteborg leaves the gate
15 h 50 apart on the timetable, overnight
BA 792 leaves 15 h 50 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.