FR 815 then EI 164 at Dublin
Edinburgh → Dublin → London Heathrow
Timetable, Dublin time
20:25FR 815 from Edinburgh at the gate
12:05EI 164 to London Heathrow leaves the gate
15 h 40 apart on the timetable, overnight
EI 164 leaves 15 h 40 after FR 815 arrives on the timetable: more than half a day, so not a connection we count.