FR 262 then FR 337 at Dublin
Alicante → Dublin → London Luton
Timetable, Dublin time
16:10FR 262 from Alicante at the gate
10:45FR 337 to London Luton leaves the gate
18 h 35 apart on the timetable, overnight
FR 337 leaves 18 h 35 after FR 262 arrives on the timetable: more than half a day, so not a connection we count.