BA 569 then BA 35 at Heathrow
Milan Linate → London → Chennai
Timetable, London time
14:30BA 569 from Milan Linate at the gate
14:10BA 35 to Chennai leaves the gate
23 h 40 apart on the timetable, overnight
BA 35 leaves 23 h 40 after BA 569 arrives on the timetable: more than half a day, so not a connection we count.