EC 8400 then U2 8783 at Gatwick
Paris Charles de Gaulle → London → Prague
Timetable, London time
15:50EC 8400 from Paris Charles de Gaulle at the gate
06:50U2 8783 to Prague leaves the gate
15 h apart on the timetable, overnight
U2 8783 leaves 15 h after EC 8400 arrives on the timetable: more than half a day, so not a connection we count.