FR 31 then FR 1986 at Dublin
London Stansted → Dublin → Nantes
Timetable, Dublin time
13:10FR 31 from London Stansted at the gate
05:45FR 1986 to Nantes leaves the gate
16 h 35 apart on the timetable, overnight
FR 1986 leaves 16 h 35 after FR 31 arrives on the timetable: more than half a day, so not a connection we count.