BA 349 then BA 1490 at Heathrow
Nice → London → Glasgow
Timetable, London time
21:05BA 349 from Nice at the gate
18:00BA 1490 to Glasgow leaves the gate
20 h 55 apart on the timetable, overnight
BA 1490 leaves 20 h 55 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.