FR 3877 then IB 723 at Madrid
Tangier → Madrid → London Heathrow
Timetable, Madrid time
17:35FR 3877 from Tangier at the gate
16:50IB 723 to London Heathrow leaves the gatealso LA 1702, VY 5421, QR 6907, BA 7050
23 h 15 apart on the timetable, overnight
IB 723 leaves 23 h 15 after FR 3877 arrives on the timetable: more than half a day, so not a connection we count.