BA 476 then IB 5480 at Barcelona
London Heathrow → Barcelona → Nantes
Timetable, Barcelona time
11:35BA 476 from London Heathrow at the gate
10:45IB 5480 to Nantes leaves the gatealso VY 8140
23 h 10 apart on the timetable, overnight
IB 5480 leaves 23 h 10 after BA 476 arrives on the timetable: more than half a day, so not a connection we count.