FR 817 then EI 172 at Dublin
Edinburgh → Dublin → London Heathrow
Timetable, Dublin time
19:00FR 817 from Edinburgh at the gate
15:30EI 172 to London Heathrow leaves the gate
20 h 30 apart on the timetable, overnight
EI 172 leaves 20 h 30 after FR 817 arrives on the timetable: more than half a day, so not a connection we count.