QR 3751 then BA 485 at Barcelona
Seville → Barcelona → London Heathrow
Timetable, Barcelona time
00:25QR 3751 from Seville at the gate
17:30BA 485 to London Heathrow leaves the gatealso IB 3666, AA 6821, VY 9563
17 h 05 apart on the timetable
BA 485 leaves 17 h 05 after QR 3751 arrives on the timetable: more than half a day, so not a connection we count.