FR 553 then EI 174 at Dublin
Manchester → Dublin → London Heathrow
Timetable, Dublin time
21:25FR 553 from Manchester at the gate
16:30EI 174 to London Heathrow leaves the gate
19 h 05 apart on the timetable, overnight
EI 174 leaves 19 h 05 after FR 553 arrives on the timetable: more than half a day, so not a connection we count.