EC 8064 then EC 8383 at Gatwick
Barcelona → London → Bordeaux
Timetable, London time
08:35EC 8064 from Barcelona at the gate
20:45EC 8383 to Bordeaux leaves the gate
12 h 10 apart on the timetable
EC 8383 leaves 12 h 10 after EC 8064 arrives on the timetable: more than half a day, so not a connection we count.