FR 1987 then FR 1556 at Dublin
Nantes → Dublin → Manchester
Timetable, Dublin time
16:55FR 1987 from Nantes at the gate
13:00FR 1556 to Manchester leaves the gate
20 h 05 apart on the timetable, overnight
FR 1556 leaves 20 h 05 after FR 1987 arrives on the timetable: more than half a day, so not a connection we count.