BA 1499 then AI 130 at Heathrow
Glasgow → London → Mumbai
Timetable, London time
08:10BA 1499 from Glasgow at the gate
20:30AI 130 to Mumbai leaves the gate
12 h 20 apart on the timetable
AI 130 leaves 12 h 20 after BA 1499 arrives on the timetable: more than half a day, so not a connection we count.