BA 138 then BA 1326 at Heathrow
Mumbai → London → Newcastle
Timetable, London time
07:05BA 138 from Mumbai at the gate
06:35BA 1326 to Newcastle leaves the gate
23 h 30 apart on the timetable, overnight
BA 1326 leaves 23 h 30 after BA 138 arrives on the timetable: more than half a day, so not a connection we count.