FR 7595 then BA 633 at Athens
Budapest → Athens → London Heathrow
Timetable, Athens time
00:30FR 7595 from Budapest at the gate
16:25BA 633 to London Heathrow leaves the gate
15 h 55 apart on the timetable
BA 633 leaves 15 h 55 after FR 7595 arrives on the timetable: more than half a day, so not a connection we count.