FR 7178 then OS 337 at Vienna
Rome → Vienna → London Heathrow
Timetable, Vienna time
21:35FR 7178 from Rome at the gate
17:15OS 337 to London Heathrow leaves the gate
19 h 40 apart on the timetable, overnight
OS 337 leaves 19 h 40 after FR 7178 arrives on the timetable: more than half a day, so not a connection we count.