FR 5569 then FR 255 at Dublin
Rome → Dublin → London Stansted
Timetable, Dublin time
23:55FR 5569 from Rome at the gate
18:45FR 255 to London Stansted leaves the gate
18 h 50 apart on the timetable, overnight
FR 255 leaves 18 h 50 after FR 5569 arrives on the timetable: more than half a day, so not a connection we count.