FR 5150 then BA 839 at Dublin
Glasgow → Dublin → London Heathrow
Timetable, Dublin time
23:40FR 5150 from Glasgow at the gate
20:40BA 839 to London Heathrow leaves the gate
21 h apart on the timetable, overnight
BA 839 leaves 21 h after FR 5150 arrives on the timetable: more than half a day, so not a connection we count.