FR 5825 then BA 637 at Athens
Venezia → Athens → London Heathrow
Timetable, Athens time
23:20FR 5825 from Venezia at the gate
20:05BA 637 to London Heathrow leaves the gate
20 h 45 apart on the timetable, overnight
BA 637 leaves 20 h 45 after FR 5825 arrives on the timetable: more than half a day, so not a connection we count.