EC 4389 then IB 723 at Madrid
Lyon → Madrid → London Heathrow
Timetable, Madrid time
17:20EC 4389 from Lyon at the gate
16:45IB 723 to London Heathrow leaves the gatealso LA 1702, VY 5421, QR 6907, AA 8770
23 h 25 apart on the timetable, overnight
IB 723 leaves 23 h 25 after EC 4389 arrives on the timetable: more than half a day, so not a connection we count.