BA 941 then BA 754 at Heathrow
Düsseldorf → London → Basel
Timetable, London time
07:40BA 941 from Düsseldorf at the gate
07:30BA 754 to Basel leaves the gate
23 h 50 apart on the timetable, overnight
BA 754 leaves 23 h 50 after BA 941 arrives on the timetable: more than half a day, so not a connection we count.