FR 339 then FR 1556 at Dublin
London Luton → Dublin → Manchester
Timetable, Dublin time
20:30FR 339 from London Luton at the gate
13:00FR 1556 to Manchester leaves the gate
16 h 30 apart on the timetable, overnight
FR 1556 leaves 16 h 30 after FR 339 arrives on the timetable: more than half a day, so not a connection we count.