BA 826 then FR 3977 at Dublin
London Heathrow → Dublin → Barcelona
Timetable, Dublin time
14:15BA 826 from London Heathrow at the gate
08:50FR 3977 to Barcelona leaves the gate
18 h 35 apart on the timetable, overnight
FR 3977 leaves 18 h 35 after BA 826 arrives on the timetable: more than half a day, so not a connection we count.