QR 3700 then BA 479 at Barcelona
Valladolid → Barcelona → London Heathrow
Timetable, Barcelona time
19:25QR 3700 from Valladolid at the gate
13:35BA 479 to London Heathrow leaves the gate
18 h 10 apart on the timetable, overnight
BA 479 leaves 18 h 10 after QR 3700 arrives on the timetable: more than half a day, so not a connection we count.