FB 851 then BA 948 at Heathrow
Sofia → London → Munich
Timetable, London time
16:45FB 851 from Sofia at the gate
12:05BA 948 to Munich leaves the gate
19 h 20 apart on the timetable, overnight
BA 948 leaves 19 h 20 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.