FR 456 then BA 827 at Dublin
Leeds → Dublin → London Heathrow
Timetable, Dublin time
20:35FR 456 from Leeds at the gate
15:10BA 827 to London Heathrow leaves the gate
18 h 35 apart on the timetable, overnight
BA 827 leaves 18 h 35 after FR 456 arrives on the timetable: more than half a day, so not a connection we count.