QR 3671 then BA 481 at Barcelona
Rome → Barcelona → London Heathrow
Timetable, Barcelona time
01:25QR 3671 from Rome at the gatealso IB 5773, LL 5773
14:40BA 481 to London Heathrow leaves the gatealso IB 3663, AA 6819, VY 9559, QR 9800
13 h 15 apart on the timetable
BA 481 leaves 13 h 15 after QR 3671 arrives on the timetable: more than half a day, so not a connection we count.