BA 1349 then BA 758 at Heathrow
Saint Helier → London → Basel
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
12:55BA 758 to Basel leaves the gate
20 h 35 apart on the timetable, overnight
BA 758 leaves 20 h 35 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.