BA 1349 then BA 762 at Heathrow
Saint Helier → London → Basel
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
16:00BA 762 to Basel leaves the gate
23 h 40 apart on the timetable, overnight
BA 762 leaves 23 h 40 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.