BA 483 then VS 354 at Heathrow
Barcelona → London → Mumbai
Timetable, London time
19:25BA 483 from Barcelona at the gate
18:15VS 354 to Mumbai leaves the gate
22 h 50 apart on the timetable, overnight
VS 354 leaves 22 h 50 after BA 483 arrives on the timetable: more than half a day, so not a connection we count.