BA 369 then BA 350 at Heathrow
Marseille → London → Nice
Timetable, London time
16:45BA 369 from Marseille at the gate
16:35BA 350 to Nice leaves the gate
23 h 50 apart on the timetable, overnight
BA 350 leaves 23 h 50 after BA 369 arrives on the timetable: more than half a day, so not a connection we count.