BA 1473 then BA 1446 at Heathrow
Glasgow → London → Edinburgh
Timetable, London time
11:00BA 1473 from Glasgow at the gate
10:20BA 1446 to Edinburgh leaves the gate
23 h 20 apart on the timetable, overnight
BA 1446 leaves 23 h 20 after BA 1473 arrives on the timetable: more than half a day, so not a connection we count.