BA 1487 then BA 546 at Heathrow
Glasgow → London → Bologna
Timetable, London time
19:30BA 1487 from Glasgow at the gate
18:30BA 546 to Bologna leaves the gate
23 h apart on the timetable, overnight
BA 546 leaves 23 h after BA 1487 arrives on the timetable: more than half a day, so not a connection we count.