FR 817 then EI 174 at Dublin
Edinburgh → Dublin → London Heathrow
Timetable, Dublin time
19:00FR 817 from Edinburgh at the gate
16:30EI 174 to London Heathrow leaves the gate
21 h 30 apart on the timetable, overnight
EI 174 leaves 21 h 30 after FR 817 arrives on the timetable: more than half a day, so not a connection we count.