FR 1917 then BA 839 at Dublin
Manchester → Dublin → London Heathrow
Timetable, Dublin time
23:15FR 1917 from Manchester at the gate
20:40BA 839 to London Heathrow leaves the gate
21 h 25 apart on the timetable, overnight
BA 839 leaves 21 h 25 after FR 1917 arrives on the timetable: more than half a day, so not a connection we count.