BA 349 then BA 784 at Heathrow
Nice → London → Stockholm
Timetable, London time
21:05BA 349 from Nice at the gate
19:55BA 784 to Stockholm leaves the gate
22 h 50 apart on the timetable, overnight
BA 784 leaves 22 h 50 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.