FR 6596 then BA 8064 at Barcelona
Manchester → Barcelona → London Gatwick
Timetable, Barcelona time
21:05FR 6596 from Manchester at the gate
12:30BA 8064 to London Gatwick leaves the gate
15 h 25 apart on the timetable, overnight
BA 8064 leaves 15 h 25 after FR 6596 arrives on the timetable: more than half a day, so not a connection we count.