BA 1383 then BA 592 at Heathrow
Manchester → London → Venezia
Timetable, London time
08:00BA 1383 from Manchester at the gate
07:55BA 592 to Venezia leaves the gate
23 h 55 apart on the timetable, overnight
BA 592 leaves 23 h 55 after BA 1383 arrives on the timetable: more than half a day, so not a connection we count.