BA 941 then BA 458 at Heathrow
Düsseldorf → London → Madrid
Timetable, London time
07:45BA 941 from Düsseldorf at the gate
07:30BA 458 to Madrid leaves the gate
23 h 45 apart on the timetable, overnight
BA 458 leaves 23 h 45 after BA 941 arrives on the timetable: more than half a day, so not a connection we count.