BA 1497 then BA 592 at Heathrow
Glasgow → London → Venezia
Timetable, London time
09:35BA 1497 from Glasgow at the gate
07:45BA 592 to Venezia leaves the gate
22 h 10 apart on the timetable, overnight
BA 592 leaves 22 h 10 after BA 1497 arrives on the timetable: more than half a day, so not a connection we count.