Film “festivals” which feature Japanese films include Raindance, London East Asian Film Festival as well as the main London BFI event.

The Japan Foundation  film programme each year has showings across , London and UK). It also has had  bookable free showings of Japanese films in the summer.

Free? Try the Japanese Embassy, film showings, but usually I don't get in!

The Korean Cultural Centre also shows free films monthly often with relevance to Japanese interests or history.

The Japan Film Club at the Japan Society has offered more films online to watch before meeting to discuss.  the arrangements for the Japanese Film Club, see the free talks page for link to Japan Society/