FR 331 then FR 457 at Dublin
London Luton → Dublin → Leeds
Timetable, Dublin time
17:15FR 331 from London Luton at the gate
13:55FR 457 to Leeds leaves the gate
20 h 40 apart on the timetable, overnight
FR 457 leaves 20 h 40 after FR 331 arrives on the timetable: more than half a day, so not a connection we count.