FR 5150 then EI 172 at Dublin
Glasgow → Dublin → London Heathrow
Timetable, Dublin time
23:40FR 5150 from Glasgow at the gate
15:30EI 172 to London Heathrow leaves the gate
15 h 50 apart on the timetable, overnight
EI 172 leaves 15 h 50 after FR 5150 arrives on the timetable: more than half a day, so not a connection we count.