BA 965 then BA 11 at Heathrow
Hamburg → London → Singapore
Timetable, London time
21:30BA 965 from Hamburg at the gate
18:45BA 11 to Singapore leaves the gate
21 h 15 apart on the timetable, overnight
BA 11 leaves 21 h 15 after BA 965 arrives on the timetable: more than half a day, so not a connection we count.