BA 1347 then BA 892 at Heathrow
Saint Helier → London → Sofia
Timetable, London time
11:45BA 1347 from Saint Helier at the gate
11:10BA 892 to Sofia leaves the gate
23 h 25 apart on the timetable, overnight
BA 892 leaves 23 h 25 after BA 1347 arrives on the timetable: more than half a day, so not a connection we count.