FB 851 then BA 1332 at Heathrow
Sofia → London → Newcastle
Timetable, London time
16:45FB 851 from Sofia at the gate
11:45BA 1332 to Newcastle leaves the gate
19 h apart on the timetable, overnight
BA 1332 leaves 19 h after FB 851 arrives on the timetable: more than half a day, so not a connection we count.