FR 3881 then EI 184 at Dublin
Dubrovnik → Dublin → London Heathrow
Timetable, Dublin time
23:05FR 3881 from Dubrovnik at the gate
19:45EI 184 to London Heathrow leaves the gate
20 h 40 apart on the timetable, overnight
EI 184 leaves 20 h 40 after FR 3881 arrives on the timetable: more than half a day, so not a connection we count.