The United Kingdom's National Tennis Centre at Roehampton in south-west London is the high-performance training facility of the Lawn Tennis Association (LTA). It was officially opened by Queen Elizabeth II on 29 March 2007. The centre has 16 outdoor courts, covering all the Grand Slam surfaces, six indoor courts, a gymnasium and sports science and medical facilities. It also houses the administration of the LTA, which was previously based at the Queen's Club in West Kensington. The National Tennis Centre was designed by Hopkins Architects, the designers of Portcullis House.