BA 941 then BA 490 at Heathrow
Düsseldorf → London → Gibraltar
Timetable, London time
09:30BA 941 from Düsseldorf at the gate
06:45BA 490 to Gibraltar leaves the gate
21 h 15 apart on the timetable, overnight
BA 490 leaves 21 h 15 after BA 941 arrives on the timetable: more than half a day, so not a connection we count.