BA 136 then BA 1448 at Heathrow
New Delhi → London → Edinburgh
Timetable, London time
11:55BA 136 from New Delhi at the gate
11:40BA 1448 to Edinburgh leaves the gate
23 h 45 apart on the timetable, overnight
BA 1448 leaves 23 h 45 after BA 136 arrives on the timetable: more than half a day, so not a connection we count.