BA 819 then IB 726 at Heathrow
Copenhagen → London → Madrid
Timetable, London time
07:35BA 819 from Copenhagen at the gate
19:40IB 726 to Madrid leaves the gate
12 h 05 apart on the timetable
IB 726 leaves 12 h 05 after BA 819 arrives on the timetable: more than half a day, so not a connection we count.