FR 3881 then EI 174 at Dublin
Dubrovnik → Dublin → London Heathrow
Timetable, Dublin time
23:05FR 3881 from Dubrovnik at the gate
16:30EI 174 to London Heathrow leaves the gate
17 h 25 apart on the timetable, overnight
EI 174 leaves 17 h 25 after FR 3881 arrives on the timetable: more than half a day, so not a connection we count.