BA 474 then FR 3976 at Barcelona
London Heathrow → Barcelona → Dublin
Timetable, Barcelona time
10:25BA 474 from London Heathrow at the gate
06:40FR 3976 to Dublin leaves the gate
20 h 15 apart on the timetable, overnight
FR 3976 leaves 20 h 15 after BA 474 arrives on the timetable: more than half a day, so not a connection we count.