BA 1367 then BA 892 at Heathrow
Manchester → London → Sofia
Timetable, London time
14:10BA 1367 from Manchester at the gate
11:10BA 892 to Sofia leaves the gate
21 h apart on the timetable, overnight
BA 892 leaves 21 h after BA 1367 arrives on the timetable: more than half a day, so not a connection we count.