EI 749 then BA 837 at Dublin
Bilbao → Dublin → London Heathrow
Timetable, Dublin time
20:15EI 749 from Bilbao at the gate
19:25BA 837 to London Heathrow leaves the gate
23 h 10 apart on the timetable, overnight
BA 837 leaves 23 h 10 after EI 749 arrives on the timetable: more than half a day, so not a connection we count.