FR 3929 then FR 9811 at Barcelona
Trieste → Barcelona → London Stansted
Timetable, Barcelona time
15:30FR 3929 from Trieste at the gate
14:10FR 9811 to London Stansted leaves the gate
22 h 40 apart on the timetable, overnight
FR 9811 leaves 22 h 40 after FR 3929 arrives on the timetable: more than half a day, so not a connection we count.