FB 851 then MH 3 at Heathrow
Sofia → London → Kuala Lumpur
Timetable, London time
16:45FB 851 from Sofia at the gate
10:25MH 3 to Kuala Lumpur leaves the gate
17 h 40 apart on the timetable, overnight
MH 3 leaves 17 h 40 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.