FR 3050 then FR 7808 at Barcelona
Krakow → Barcelona → London Luton
Timetable, Barcelona time
16:15FR 3050 from Krakow at the gate
12:45FR 7808 to London Luton leaves the gate
20 h 30 apart on the timetable, overnight
FR 7808 leaves 20 h 30 after FR 3050 arrives on the timetable: more than half a day, so not a connection we count.