BA 64 then BA 1410 at Heathrow
Nairobi → London → Belfast City
Timetable, London time
06:15BA 64 from Nairobi at the gate
19:00BA 1410 to Belfast City leaves the gate
12 h 45 apart on the timetable
BA 1410 leaves 12 h 45 after BA 64 arrives on the timetable: more than half a day, so not a connection we count.