FR 7763 then FR 340 at Dublin
Alicante → Dublin → London Luton
Timetable, Dublin time
20:05FR 7763 from Alicante at the gate
12:50FR 340 to London Luton leaves the gate
16 h 45 apart on the timetable, overnight
FR 340 leaves 16 h 45 after FR 7763 arrives on the timetable: more than half a day, so not a connection we count.