BA 349 then EK 4 at Heathrow
Nice → London → Dubai
Timetable, London time
21:05BA 349 from Nice at the gate
20:20EK 4 to Dubai leaves the gate
23 h 15 apart on the timetable, overnight
EK 4 leaves 23 h 15 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.