FR 6712 then BA 463 at Madrid
Budapest → Madrid → London Heathrow
Timetable, Madrid time
18:10FR 6712 from Budapest at the gate
14:40BA 463 to London Heathrow leaves the gate
20 h 30 apart on the timetable, overnight
BA 463 leaves 20 h 30 after FR 6712 arrives on the timetable: more than half a day, so not a connection we count.