FR 553 then FR 122 at Dublin
Manchester → Dublin → London Gatwick
Timetable, Dublin time
07:00FR 553 from Manchester at the gate
19:40FR 122 to London Gatwick leaves the gate
12 h 40 apart on the timetable
FR 122 leaves 12 h 40 after FR 553 arrives on the timetable: more than half a day, so not a connection we count.