QR 3754 then BA 8064 at Barcelona
Santander → Barcelona → London Gatwick
Timetable, Barcelona time
19:05QR 3754 from Santander at the gate
12:30BA 8064 to London Gatwick leaves the gate
17 h 25 apart on the timetable, overnight
BA 8064 leaves 17 h 25 after QR 3754 arrives on the timetable: more than half a day, so not a connection we count.