Indoor Sports Centres Mr. Roy Hughes asked the Secretary of State for the Environment if he will list the purpose-built indoor sports centres that can hold an audience of 5,000 people and 10,000 people, respectively. Mr. Denis Howell The only purpose-built indoor sports centres with this audience capacity are the Empire Pool, Wembley, which can seat 8,000 to 10,000, and the Sobell Centre, Islington, which can take 5,000.