EC 1703 then BA 461 at Madrid
Nice → Madrid → London Heathrow
Timetable, Madrid time
20:40EC 1703 from Nice at the gate
13:55BA 461 to London Heathrow leaves the gate
17 h 15 apart on the timetable, overnight
BA 461 leaves 17 h 15 after EC 1703 arrives on the timetable: more than half a day, so not a connection we count.