FR 879 then BA 479 at Barcelona
Venezia → Barcelona → London Heathrow
Timetable, Barcelona time
22:30FR 879 from Venezia at the gate
13:35BA 479 to London Heathrow leaves the gate
15 h 05 apart on the timetable, overnight
BA 479 leaves 15 h 05 after FR 879 arrives on the timetable: more than half a day, so not a connection we count.