FR 6974 then BA 8064 at Barcelona
Rome → Barcelona → London Gatwick
Timetable, Barcelona time
16:25FR 6974 from Rome at the gate
12:30BA 8064 to London Gatwick leaves the gate
20 h 05 apart on the timetable, overnight
BA 8064 leaves 20 h 05 after FR 6974 arrives on the timetable: more than half a day, so not a connection we count.