BA 456 then IB 427 at Madrid
London Heathrow → Madrid → Barcelona
Timetable, Madrid time
09:30BA 456 from London Heathrow at the gate
21:40IB 427 to Barcelona leaves the gatealso IB 427S, LA 1530, LL 3027, OB 5008, VY 5091, AT 5339, AY 5575, QR 6927, CZ 7312
12 h 10 apart on the timetable
IB 427 leaves 12 h 10 after BA 456 arrives on the timetable: more than half a day, so not a connection we count.