BA 42 then BA 870 at Heathrow
Cape Town → London → Budapest
Timetable, London time
06:40BA 42 from Cape Town at the gate
19:25BA 870 to Budapest leaves the gate
12 h 45 apart on the timetable
BA 870 leaves 12 h 45 after BA 42 arrives on the timetable: more than half a day, so not a connection we count.