Objective: To investigate meals, price, nutritional content, and nutrition and portion size information available on children's menus in fast-food and table-service chain restaurants in London, since the United Kingdom does not currently require such information but may be initiating a voluntary guideline. Methods: Children's menus were assessed in 22 chain restaurants for portion size information, nutrition information, and price. The most healthful available meal was purchased and analyzed for nutritional content and portion size. Results: Nutrition and portion size information was not provided in 67% of the restaurants. Fast-food restaurants were significantly cheaper, had smaller portion sizes than table-service restaurants, and provided fewer portions of fruit, vegetables, iron, and vitamin C. Conclusions and Implications: Not all restaurants provided nutrition or portion size information. Differences in portion size and nutritional content between fast-food and table-service restaurants were established, and both were below recommendations. In the future, nutrition labeling in restaurants in the United Kingdom may provide consumers with the nutrition and portion size information necessary to help make appropriate choices. (Contains 2 tables.)