FR 2403 then FR 8231 at Barcelona
Seville → Barcelona → London Stansted
Timetable, Barcelona time
10:05FR 2403 from Seville at the gate
07:30FR 8231 to London Stansted leaves the gate
21 h 25 apart on the timetable, overnight
FR 8231 leaves 21 h 25 after FR 2403 arrives on the timetable: more than half a day, so not a connection we count.