QR 3671 then BA 483 at Barcelona
Rome → Barcelona → London Heathrow
Timetable, Barcelona time
01:25QR 3671 from Rome at the gatealso IB 5773, LL 5773, VY 6021
15:30BA 483 to London Heathrow leaves the gatealso IB 3780, AY 5938, QR 5984, AA 7061, VY 9561
14 h 05 apart on the timetable
BA 483 leaves 14 h 05 after QR 3671 arrives on the timetable: more than half a day, so not a connection we count.