FB 851 then KL 1002 at Heathrow
Sofia → London → Amsterdam
Timetable, London time
16:45FB 851 from Sofia at the gate
08:40KL 1002 to Amsterdam leaves the gate
15 h 55 apart on the timetable, overnight
KL 1002 leaves 15 h 55 after FB 851 arrives on the timetable: more than half a day, so not a connection we count.