BA 929 then UL 504 at Heathrow
Hannover → London → Colombo
Timetable, London time
22:35BA 929 from Hannover at the gate
20:40UL 504 to Colombo leaves the gate
22 h 05 apart on the timetable, overnight
UL 504 leaves 22 h 05 after BA 929 arrives on the timetable: more than half a day, so not a connection we count.