FR 270 then BA 481 at Barcelona
Milan → Barcelona → London Heathrow
Timetable, Barcelona time
16:45FR 270 from Milan at the gate
14:40BA 481 to London Heathrow leaves the gatealso IB 3663, AA 6819, VY 9559, QR 9800
21 h 55 apart on the timetable, overnight
BA 481 leaves 21 h 55 after FR 270 arrives on the timetable: more than half a day, so not a connection we count.