FR 879 then FR 8231 at Barcelona
Venezia → Barcelona → London Stansted
Timetable, Barcelona time
07:50FR 879 from Venezia at the gate
07:30FR 8231 to London Stansted leaves the gate
23 h 40 apart on the timetable, overnight
FR 8231 leaves 23 h 40 after FR 879 arrives on the timetable: more than half a day, so not a connection we count.