BA 423 then BA 137 at Heathrow
Málaga → London → New Delhi
Timetable, London time
15:15BA 423 from Málaga at the gate
15:05BA 137 to New Delhi leaves the gate
23 h 50 apart on the timetable, overnight
BA 137 leaves 23 h 50 after BA 423 arrives on the timetable: more than half a day, so not a connection we count.