EI 3257 then FR 122 at Dublin
Edinburgh → Dublin → London Gatwick
Timetable, Dublin time
17:40EI 3257 from Edinburgh at the gate
15:55FR 122 to London Gatwick leaves the gate
22 h 15 apart on the timetable, overnight
FR 122 leaves 22 h 15 after EI 3257 arrives on the timetable: more than half a day, so not a connection we count.