BA 971 then BA 418 at Heathrow
Hamburg → London → Luxembourg
Timetable, London time
07:30BA 971 from Hamburg at the gate
06:05BA 418 to Luxembourg leaves the gate
22 h 35 apart on the timetable, overnight
BA 418 leaves 22 h 35 after BA 971 arrives on the timetable: more than half a day, so not a connection we count.