QR 3573 then BA 487 at Barcelona
Gran Canaria → Barcelona → London Heathrow
Timetable, Barcelona time
00:35QR 3573 from Gran Canaria at the gate
18:30BA 487 to London Heathrow leaves the gatealso IB 3668, AA 6823, VY 9565
17 h 55 apart on the timetable
BA 487 leaves 17 h 55 after QR 3573 arrives on the timetable: more than half a day, so not a connection we count.