BA 367 then BA 352 at Heathrow
Marseille → London → Nice
Timetable, London time
19:40BA 367 from Marseille at the gate
18:05BA 352 to Nice leaves the gate
22 h 25 apart on the timetable, overnight
BA 352 leaves 22 h 25 after BA 367 arrives on the timetable: more than half a day, so not a connection we count.