LY 543 then BA 633 at Athens
Tel Aviv → Athens → London Heathrow
Timetable, Athens time
21:20LY 543 from Tel Aviv at the gate
16:25BA 633 to London Heathrow leaves the gate
19 h 05 apart on the timetable, overnight
BA 633 leaves 19 h 05 after LY 543 arrives on the timetable: more than half a day, so not a connection we count.