FR 507 then FR 373 at Dublin
Bristol → Dublin → London Luton
Timetable, Dublin time
20:20FR 507 from Bristol at the gate
11:15FR 373 to London Luton leaves the gate
14 h 55 apart on the timetable, overnight
FR 373 leaves 14 h 55 after FR 507 arrives on the timetable: more than half a day, so not a connection we count.