EI 165 then FR 3977 at Dublin
London Heathrow → Dublin → Barcelona
Timetable, Dublin time
15:40EI 165 from London Heathrow at the gate
15:35FR 3977 to Barcelona leaves the gate
23 h 55 apart on the timetable, overnight
FR 3977 leaves 23 h 55 after EI 165 arrives on the timetable: more than half a day, so not a connection we count.