It shouldn't be a huge surprise to know JAL flights from Japan to London (but not the other way round) are diverted to fly over Alaska, Northern Canada and Greenland in order to avoid the Russian airspace; this would probably be a scenic ride over the Arctic area.

JL 41 departs from Tokyo at midnight and arrives London early in the morning, while JL 43 departs in the morning and lands in the afternoon.
For JL 41, when should I expect sunrise to begin before arriving into London?
For JL 43, would the entire flight be under daylight or I'll observe both sunset and sunrise during the journey?
In addition, what would be the chances of being able to see the northern lights when flying over the Arctic region?

timings for reference: HND - LHR
JL 41 00:20 - 06:25
JL 43 09:45 - 15:50

would appreciate any experience on these two flights on the Eastern route!