BA 1349 then BA 716 at Heathrow
Saint Helier → London → Zurich
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
12:45BA 716 to Zurich leaves the gate
20 h 25 apart on the timetable, overnight
BA 716 leaves 20 h 25 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.