FR 809 then FR 340 at Dublin
Edinburgh → Dublin → London Luton
Timetable, Dublin time
20:50FR 809 from Edinburgh at the gate
19:45FR 340 to London Luton leaves the gate
22 h 55 apart on the timetable, overnight
FR 340 leaves 22 h 55 after FR 809 arrives on the timetable: more than half a day, so not a connection we count.