FR 3976 then EI 3304 at Dublin
Barcelona → Dublin → Southampton
Timetable, Dublin time
19:00FR 3976 from Barcelona at the gate
10:15EI 3304 to Southampton leaves the gate
15 h 15 apart on the timetable, overnight
EI 3304 leaves 15 h 15 after FR 3976 arrives on the timetable: more than half a day, so not a connection we count.