OS 552 then FR 729 at Vienna
Rome → Vienna → London Stansted
Timetable, Vienna time
11:55OS 552 from Rome at the gate
06:40FR 729 to London Stansted leaves the gate
18 h 45 apart on the timetable, overnight
FR 729 leaves 18 h 45 after OS 552 arrives on the timetable: more than half a day, so not a connection we count.