6H 561 then BA 631 at Athens
Tel Aviv → Athens → London Heathrow
Timetable, Athens time
17:556H 561 from Tel Aviv at the gate
15:00BA 631 to London Heathrow leaves the gate
21 h 05 apart on the timetable, overnight
BA 631 leaves 21 h 05 after 6H 561 arrives on the timetable: more than half a day, so not a connection we count.