FR 6342 then BA 489 at Barcelona
Rome → Barcelona → London Heathrow
Timetable, Barcelona time
22:55FR 6342 from Rome at the gate
19:25BA 489 to London Heathrow leaves the gatealso AA 7087, VY 9612
20 h 30 apart on the timetable, overnight
BA 489 leaves 20 h 30 after FR 6342 arrives on the timetable: more than half a day, so not a connection we count.