FB 851 then BA 1330 at Heathrow
Sofia → London → Newcastle
Timetable, London time
16:45FB 851 from Sofia at the gate
10:05BA 1330 to Newcastle leaves the gate
17 h 20 apart on the timetable, overnight
BA 1330 leaves 17 h 20 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.