FR 559 then FR 340 at Dublin
Manchester → Dublin → London Luton
Timetable, Dublin time
21:35FR 559 from Manchester at the gate
20:55FR 340 to London Luton leaves the gate
23 h 20 apart on the timetable, overnight
FR 340 leaves 23 h 20 after FR 559 arrives on the timetable: more than half a day, so not a connection we count.