FR 879 then BA 485 at Barcelona
Venezia → Barcelona → London Heathrow
Timetable, Barcelona time
22:30FR 879 from Venezia at the gate
17:30BA 485 to London Heathrow leaves the gate
19 h apart on the timetable, overnight
BA 485 leaves 19 h after FR 879 arrives on the timetable: more than half a day, so not a connection we count.