BA 830 then FR 3977 at Dublin
London Heathrow → Dublin → Barcelona
Timetable, Dublin time
12:25BA 830 from London Heathrow at the gate
07:40FR 3977 to Barcelona leaves the gate
19 h 15 apart on the timetable, overnight
FR 3977 leaves 19 h 15 after BA 830 arrives on the timetable: more than half a day, so not a connection we count.