QR 3700 then BA 481 at Barcelona
Valladolid → Barcelona → London Heathrow
Timetable, Barcelona time
19:25QR 3700 from Valladolid at the gate
14:40BA 481 to London Heathrow leaves the gatealso IB 3663, AA 6819, VY 9559, QR 9800
19 h 15 apart on the timetable, overnight
BA 481 leaves 19 h 15 after QR 3700 arrives on the timetable: more than half a day, so not a connection we count.