If the Japanese version unlocks at 4pm UK time (midnight japan time) then I might text my kids to redeem the code on the eshop before I get home.
Although I guess it doesn't download while you're playing a game? (They'll be on Zelda as soon as they get home from school)
Hmmm... probably a silly question but will the game be the Japanese version? Or does it work like the Xbox one store and be in English no matter which region store you buy from?