QR 3758 then BA 479 at Barcelona
Valladolid → Barcelona → London Heathrow
Timetable, Barcelona time
15:35QR 3758 from Valladolid at the gate
13:35BA 479 to London Heathrow leaves the gate
22 h apart on the timetable, overnight
BA 479 leaves 22 h after QR 3758 arrives on the timetable: more than half a day, so not a connection we count.