BA 759 then BA 990 at Heathrow
Basel → London → Berlin
Timetable, London time
17:10BA 759 from Basel at the gate
16:55BA 990 to Berlin leaves the gate
23 h 45 apart on the timetable, overnight
BA 990 leaves 23 h 45 after BA 759 arrives on the timetable: more than half a day, so not a connection we count.