BA 1349 then BA 596 at Heathrow
Saint Helier → London → Venezia
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
13:50BA 596 to Venezia leaves the gate
21 h 30 apart on the timetable, overnight
BA 596 leaves 21 h 30 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.