BA 1499 then BA 820 at Heathrow
Glasgow → London → Billund
Timetable, London time
09:50BA 1499 from Glasgow at the gate
09:25BA 820 to Billund leaves the gate
23 h 35 apart on the timetable, overnight
BA 820 leaves 23 h 35 after BA 1499 arrives on the timetable: more than half a day, so not a connection we count.