FR 456 then BA 837 at Dublin
Leeds → Dublin → London Heathrow
Timetable, Dublin time
20:35FR 456 from Leeds at the gate
19:25BA 837 to London Heathrow leaves the gate
22 h 50 apart on the timetable, overnight
BA 837 leaves 22 h 50 after FR 456 arrives on the timetable: more than half a day, so not a connection we count.