BA 721 then KL 1016 at Heathrow
Zurich → London → Amsterdam
Timetable, London time
20:30BA 721 from Zurich at the gate
20:25KL 1016 to Amsterdam leaves the gate
23 h 55 apart on the timetable, overnight
KL 1016 leaves 23 h 55 after BA 721 arrives on the timetable: more than half a day, so not a connection we count.