FR 665 then FR 342 at Dublin
Birmingham (UK) → Dublin → London Luton
Timetable, Dublin time
18:20FR 665 from Birmingham (UK) at the gate
07:55FR 342 to London Luton leaves the gate
13 h 35 apart on the timetable, overnight
FR 342 leaves 13 h 35 after FR 665 arrives on the timetable: more than half a day, so not a connection we count.