BA 591 then BA 372 at Heathrow
Venezia → London → Toulouse
Timetable, London time
13:10BA 591 from Venezia at the gate
13:05BA 372 to Toulouse leaves the gate
23 h 55 apart on the timetable, overnight
BA 372 leaves 23 h 55 after BA 591 arrives on the timetable: more than half a day, so not a connection we count.