FR 553 then FR 126 at Dublin
Manchester → Dublin → London Gatwick
Timetable, Dublin time
07:00FR 553 from Manchester at the gate
19:20FR 126 to London Gatwick leaves the gate
12 h 20 apart on the timetable
FR 126 leaves 12 h 20 after FR 553 arrives on the timetable: more than half a day, so not a connection we count.