KL 1414 then KL 1015 at Schiphol
Rennes → Amsterdam → London Heathrow
Timetable, Amsterdam time
19:35KL 1414 from Rennes at the gate
18:50KL 1015 to London Heathrow leaves the gate
23 h 15 apart on the timetable, overnight
KL 1015 leaves 23 h 15 after KL 1414 arrives on the timetable: more than half a day, so not a connection we count.