WB 700 then BA 391 at Brussels
Kigali → Brussels → London Heathrow
Timetable, Brussels time
17:00WB 700 from Kigali at the gate
16:10BA 391 to London Heathrow leaves the gate
23 h 10 apart on the timetable, overnight
BA 391 leaves 23 h 10 after WB 700 arrives on the timetable: more than half a day, so not a connection we count.