EW 520 then FR 9811 at Barcelona
Cologne → Barcelona → London Stansted
Timetable, Barcelona time
16:50EW 520 from Cologne at the gate
07:55FR 9811 to London Stansted leaves the gate
15 h 05 apart on the timetable, overnight
FR 9811 leaves 15 h 05 after EW 520 arrives on the timetable: more than half a day, so not a connection we count.