FR 7350 then FR 8215 at Barcelona
Vienna → Barcelona → London Stansted
Timetable, Barcelona time
18:30FR 7350 from Vienna at the gate
13:15FR 8215 to London Stansted leaves the gate
18 h 45 apart on the timetable, overnight
FR 8215 leaves 18 h 45 after FR 7350 arrives on the timetable: more than half a day, so not a connection we count.