FB 851 then KL 1010 at Heathrow
Sofia → London → Amsterdam
Timetable, London time
16:45FB 851 from Sofia at the gate
15:45KL 1010 to Amsterdam leaves the gate
23 h apart on the timetable, overnight
KL 1010 leaves 23 h after FB 851 arrives on the timetable: more than half a day, so not a connection we count.