EI 3257 then FR 337 at Dublin
Edinburgh → Dublin → London Luton
Timetable, Dublin time
17:40EI 3257 from Edinburgh at the gate
09:25FR 337 to London Luton leaves the gate
15 h 45 apart on the timetable, overnight
FR 337 leaves 15 h 45 after EI 3257 arrives on the timetable: more than half a day, so not a connection we count.