BA 349 then BA 818 at Heathrow
Nice → London → Copenhagen
Timetable, London time
21:05BA 349 from Nice at the gate
19:00BA 818 to Copenhagen leaves the gate
21 h 55 apart on the timetable, overnight
BA 818 leaves 21 h 55 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.