FR 3976 then EI 164 at Dublin
Barcelona → Dublin → London Heathrow
Timetable, Dublin time
21:25FR 3976 from Barcelona at the gate
12:05EI 164 to London Heathrow leaves the gate
14 h 40 apart on the timetable, overnight
EI 164 leaves 14 h 40 after FR 3976 arrives on the timetable: more than half a day, so not a connection we count.