FR 3109 then FR 8215 at Barcelona
Luxembourg → Barcelona → London Stansted
Timetable, Barcelona time
20:20FR 3109 from Luxembourg at the gate
19:25FR 8215 to London Stansted leaves the gate
23 h 05 apart on the timetable, overnight
FR 8215 leaves 23 h 05 after FR 3109 arrives on the timetable: more than half a day, so not a connection we count.