FB 851 then BA 946 at Heathrow
Sofia → London → Munich
Timetable, London time
16:55FB 851 from Sofia at the gate
08:50BA 946 to Munich leaves the gate
15 h 55 apart on the timetable, overnight
BA 946 leaves 15 h 55 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.