Tokyo Diner is a three-floor Japanese restaurant on the corner of Newport Place and Lisle Street in the "Chinatown" area of the West End of London. The company was formed in January 1990, and the restaurant opened to the public in December 1992. Tokyo Diner does not serve tuna. This is because it has a policy of avoiding any supplies which do not come from sources that are sustainable in the long term, and is now trying to extend awareness of the need to reduce its consumption. Another policy that is unusual for a restaurant in London, is that Tokyo Diner does not accept tips. According to its menu, tipping is not part of the culture in Japan, where paying extra for service is a foreign concept. It suggests that the most sincere way for customers to thank both the waiters and the chefs is to "please come again, and bring your friends"....