FR 879 then BA 483 at Barcelona
Venezia → Barcelona → London Heathrow
Timetable, Barcelona time
22:30FR 879 from Venezia at the gate
15:30BA 483 to London Heathrow leaves the gate
17 h apart on the timetable, overnight
BA 483 leaves 17 h after FR 879 arrives on the timetable: more than half a day, so not a connection we count.