BA 487 then MH 1 at Heathrow
Barcelona → London → Kuala Lumpur
Timetable, London time
21:35BA 487 from Barcelona at the gate
21:25MH 1 to Kuala Lumpur leaves the gate
23 h 50 apart on the timetable, overnight
MH 1 leaves 23 h 50 after BA 487 arrives on the timetable: more than half a day, so not a connection we count.