BA 1439 then BA 756 at Heathrow
Edinburgh → London → Basel
Timetable, London time
10:30BA 1439 from Edinburgh at the gate
09:25BA 756 to Basel leaves the gate
22 h 55 apart on the timetable, overnight
BA 756 leaves 22 h 55 after BA 1439 arrives on the timetable: more than half a day, so not a connection we count.