BA 853 then VS 302 at Heathrow
Prague → London → New Delhi
Timetable, London time
13:05BA 853 from Prague at the gate
12:30VS 302 to New Delhi leaves the gate
23 h 25 apart on the timetable, overnight
VS 302 leaves 23 h 25 after BA 853 arrives on the timetable: more than half a day, so not a connection we count.