FB 851 then BA 830 at Heathrow
Sofia → London → Dublin
Timetable, London time
12:10FB 851 from Sofia at the gate
11:15BA 830 to Dublin leaves the gate
23 h 05 apart on the timetable, overnight
BA 830 leaves 23 h 05 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.