QR 3728 then BA 495 at Barcelona
Lyon → Barcelona → London Heathrow
Timetable, Barcelona time
23:20QR 3728 from Lyon at the gate
20:45BA 495 to London Heathrow leaves the gatealso IB 3821, AA 6817, CX 7171, VY 9614
21 h 25 apart on the timetable, overnight
BA 495 leaves 21 h 25 after QR 3728 arrives on the timetable: more than half a day, so not a connection we count.