VS 301 then BA 588 at Heathrow
New Delhi → London → Milan
Timetable, London time
15:55VS 301 from New Delhi at the gate
15:50BA 588 to Milan leaves the gate
23 h 55 apart on the timetable, overnight
BA 588 leaves 23 h 55 after VS 301 arrives on the timetable: more than half a day, so not a connection we count.