BA 819 then BA 1346 at Heathrow
Copenhagen → London → Saint Helier
Timetable, London time
07:45BA 819 from Copenhagen at the gate
06:15BA 1346 to Saint Helier leaves the gate
22 h 30 apart on the timetable, overnight
BA 1346 leaves 22 h 30 after BA 819 arrives on the timetable: more than half a day, so not a connection we count.