BA 1382 then FR 1917 at Manchester
London Heathrow → Manchester → Dublin
Timetable, Manchester time
19:40BA 1382 from London Heathrow at the gate
15:50FR 1917 to Dublin leaves the gate
20 h 10 apart on the timetable, overnight
FR 1917 leaves 20 h 10 after BA 1382 arrives on the timetable: more than half a day, so not a connection we count.