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I'm not sure if there's a particular age you should "crack down" on their third language, but what I saw helping my young half siblings (same age as your children), also quadriligual, was dedicated playtime and interaction with a native French babysitter who would come to the house a few hours a week, specifically for interaction in French. Watching DVDs in their target languages was also helpful for vocabulary and language building.

Perhaps you could find a Japanese native graduate student in London who could spend at least a few hours a week playing and interacting with your kids? And perhaps you could find them Japanese friends their own age to interact with through a social group. Japanese DVDs could also be helpful, if they don't do that already. I think the key is to find a third person or set of people to associate and use the language with, since they know it's not necessary for communication at home.

Good luck!