FR 2018 then IB 723 at Madrid
Lanzarote → Madrid → London Heathrow
Timetable, Madrid time
23:30FR 2018 from Lanzarote at the gate
16:45IB 723 to London Heathrow leaves the gatealso LA 1702, VY 5421, QR 6907, AA 8770
17 h 15 apart on the timetable, overnight
IB 723 leaves 17 h 15 after FR 2018 arrives on the timetable: more than half a day, so not a connection we count.