FR 3976 then FR 122 at Dublin
Barcelona → Dublin → London Gatwick
Timetable, Dublin time
14:40FR 3976 from Barcelona at the gate
06:55FR 122 to London Gatwick leaves the gate
16 h 15 apart on the timetable, overnight
FR 122 leaves 16 h 15 after FR 3976 arrives on the timetable: more than half a day, so not a connection we count.