FR 6342 then BA 487 at Barcelona
Rome → Barcelona → London Heathrow
Timetable, Barcelona time
22:55FR 6342 from Rome at the gate
19:20BA 487 to London Heathrow leaves the gatealso IB 3668, AA 6823, VY 9565
20 h 25 apart on the timetable, overnight
BA 487 leaves 20 h 25 after FR 6342 arrives on the timetable: more than half a day, so not a connection we count.