3O 391 then IB 725 at Madrid
Tangier → Madrid → London Heathrow
Timetable, Madrid time
20:003O 391 from Tangier at the gate
17:20IB 725 to London Heathrow leaves the gatealso LA 1704, VY 5180, BA 7058
21 h 20 apart on the timetable, overnight
IB 725 leaves 21 h 20 after 3O 391 arrives on the timetable: more than half a day, so not a connection we count.