BA 1347 then BA 594 at Heathrow
Saint Helier → London → Venezia
Timetable, London time
11:45BA 1347 from Saint Helier at the gate
10:05BA 594 to Venezia leaves the gate
22 h 20 apart on the timetable, overnight
BA 594 leaves 22 h 20 after BA 1347 arrives on the timetable: more than half a day, so not a connection we count.