LH 900 then BA 478 at Heathrow
Frankfurt am Main → London → Barcelona
Timetable, London time
08:45LH 900 from Frankfurt am Main at the gate
08:20BA 478 to Barcelona leaves the gate
23 h 35 apart on the timetable, overnight
BA 478 leaves 23 h 35 after LH 900 arrives on the timetable: more than half a day, so not a connection we count.