BA 391 then EK 30 at Heathrow
Brussels → London → Dubai
Timetable, London time
16:15BA 391 from Brussels at the gate
15:50EK 30 to Dubai leaves the gate
23 h 35 apart on the timetable, overnight
EK 30 leaves 23 h 35 after BA 391 arrives on the timetable: more than half a day, so not a connection we count.