FR 1987 then FR 1956 at Dublin
Nantes → Dublin → Manchester
Timetable, Dublin time
16:55FR 1987 from Nantes at the gate
07:25FR 1956 to Manchester leaves the gate
14 h 30 apart on the timetable, overnight
FR 1956 leaves 14 h 30 after FR 1987 arrives on the timetable: more than half a day, so not a connection we count.