BA 735 then BA 468 at Heathrow
Geneva → London → Madrid
Timetable, London time
16:20BA 735 from Geneva at the gate
16:05BA 468 to Madrid leaves the gate
23 h 45 apart on the timetable, overnight
BA 468 leaves 23 h 45 after BA 735 arrives on the timetable: more than half a day, so not a connection we count.