FR 338 then FR 558 at Dublin
London Luton → Dublin → Manchester
Timetable, Dublin time
08:55FR 338 from London Luton at the gate
21:30FR 558 to Manchester leaves the gate
12 h 35 apart on the timetable
FR 558 leaves 12 h 35 after FR 338 arrives on the timetable: more than half a day, so not a connection we count.