KM 784 then TK 1931 at Istanbul
Valletta → Istanbul → London Heathrow
Timetable, Istanbul time
21:45KM 784 from Valletta at the gate
13:35TK 1931 to London Heathrow leaves the gate
15 h 50 apart on the timetable, overnight
TK 1931 leaves 15 h 50 after KM 784 arrives on the timetable: more than half a day, so not a connection we count.