BA 371 then BA 802 at Heathrow
Toulouse → London → Reykjavík
Timetable, London time
13:15BA 371 from Toulouse at the gate
11:45BA 802 to Reykjavík leaves the gate
22 h 30 apart on the timetable, overnight
BA 802 leaves 22 h 30 after BA 371 arrives on the timetable: more than half a day, so not a connection we count.