Atari-Ya is less a sushi restaurant, more a north London Japanese food community. Part wholesale seafood providers, there's an authenticity to Atari-Ya's atmosphere that makes it stand out from Marylebone and Mayfair's crowd of sushi restaurants. Their mostly unremarkable shopfronts and unwillingness to become hip have made them a cult favorite, and they can be found in Hendon, Ealing, and Swiss Cottage, if you happen to be further afield during your London visit. Try a deluxe Chirashi, including fish roe, crab meat, omelette, boiled prawn, and salmon, for only £10.50. They also do take-out, so you can indulge in London's best-kept Japanese secret from the comfort of your couch.