BA 1347 then AC 855 at Heathrow
Saint Helier → London → Toronto
Timetable, London time
11:45BA 1347 from Saint Helier at the gate
11:10AC 855 to Toronto leaves the gate
23 h 25 apart on the timetable, overnight
AC 855 leaves 23 h 25 after BA 1347 arrives on the timetable: more than half a day, so not a connection we count.