BA 222 then BA 820 at Heathrow
Nashville → London → Billund
Timetable, London time
08:50BA 222 from Nashville at the gate
08:35BA 820 to Billund leaves the gate
23 h 45 apart on the timetable, overnight
BA 820 leaves 23 h 45 after BA 222 arrives on the timetable: more than half a day, so not a connection we count.