QR 3573 then BA 485 at Barcelona
Gran Canaria → Barcelona → London Heathrow
Timetable, Barcelona time
00:35QR 3573 from Gran Canaria at the gate
17:00BA 485 to London Heathrow leaves the gate
16 h 25 apart on the timetable
BA 485 leaves 16 h 25 after QR 3573 arrives on the timetable: more than half a day, so not a connection we count.