FR 1556 then BA 1365 at Manchester
Dublin → Manchester → London Heathrow
Timetable, Manchester time
14:00FR 1556 from Dublin at the gate
11:55BA 1365 to London Heathrow leaves the gate
21 h 55 apart on the timetable, overnight
BA 1365 leaves 21 h 55 after FR 1556 arrives on the timetable: more than half a day, so not a connection we count.