Richard W and NikiGio thank you so much.
Japanese citizens can travel visa free to the UK, and we're planning to return together to the UK.

My wife’s residency card expires in few months, how can she enter the UK after the expiration? She entered the country with EEA Family Permit, then applied for a residency card which is now expiring after 5 years. She is Non EEA (Japanese), married to an EU citizen (me), I also have a "indefinite le...