Visiting London? Forget fish and chips and try Wagamama, a Japanese noodle restaurant in trendy Soho. The British are mad for noodles, and this fast-paced, in-the-basement restaurant maintains a steady line of fans from lunchtime on. The ramen entrees are winners, and the Web site, www.wagamama.com, includes a full menu and store locations in Manchester, Amsterdam, Dublin, and throughout London.