FR 3976 then FR 116 at Dublin
Barcelona → Dublin → London Gatwick
Timetable, Dublin time
19:00FR 3976 from Barcelona at the gate
07:50FR 116 to London Gatwick leaves the gate
12 h 50 apart on the timetable, overnight
FR 116 leaves 12 h 50 after FR 3976 arrives on the timetable: more than half a day, so not a connection we count.