BA 365 then BA 484 at Heathrow
Marseille → London → Barcelona
Timetable, London time
13:25BA 365 from Marseille at the gate
13:20BA 484 to Barcelona leaves the gate
23 h 55 apart on the timetable, overnight
BA 484 leaves 23 h 55 after BA 365 arrives on the timetable: more than half a day, so not a connection we count.