KM 784 then BA 677 at Istanbul
Valletta → Istanbul → London Heathrow
Timetable, Istanbul time
21:45KM 784 from Valletta at the gate
14:55BA 677 to London Heathrow leaves the gate
17 h 10 apart on the timetable, overnight
BA 677 leaves 17 h 10 after KM 784 arrives on the timetable: more than half a day, so not a connection we count.