FR 553 then BA 837 at Dublin
Manchester → Dublin → London Heathrow
Timetable, Dublin time
07:00FR 553 from Manchester at the gate
19:25BA 837 to London Heathrow leaves the gate
12 h 25 apart on the timetable
BA 837 leaves 12 h 25 after FR 553 arrives on the timetable: more than half a day, so not a connection we count.