QR 7 then BA 772 at Heathrow
Doha → London → Oslo
Timetable, London time
13:25QR 7 from Doha at the gate
12:45BA 772 to Oslo leaves the gate
23 h 20 apart on the timetable, overnight
BA 772 leaves 23 h 20 after QR 7 arrives on the timetable: more than half a day, so not a connection we count.