KL 1414 then BA 445 at Schiphol
Rennes → Amsterdam → London Heathrow
Timetable, Amsterdam time
19:35KL 1414 from Rennes at the gate
19:15BA 445 to London Heathrow leaves the gate
23 h 40 apart on the timetable, overnight
BA 445 leaves 23 h 40 after KL 1414 arrives on the timetable: more than half a day, so not a connection we count.