FR 815 then FR 340 at Dublin
Edinburgh → Dublin → London Luton
Timetable, Dublin time
14:15FR 815 from Edinburgh at the gate
12:50FR 340 to London Luton leaves the gate
22 h 35 apart on the timetable, overnight
FR 340 leaves 22 h 35 after FR 815 arrives on the timetable: more than half a day, so not a connection we count.