FB 851 then EK 8 at Heathrow
Sofia → London → Dubai
Timetable, London time
12:10FB 851 from Sofia at the gate
09:10EK 8 to Dubai leaves the gate
21 h apart on the timetable, overnight
EK 8 leaves 21 h after FB 851 arrives on the timetable: more than half a day, so not a connection we count.