Television People in Britain watch on average 25 hours of TV every week. Television viewing is Britain’s most popular leisure pastime. About 96 % of the population of Britain have television in their homes. In 1999, 13% of households had satellite television and 9% cable television. It is estimated that about 10 % of household have two or more sets. There are five main channels in Britain: • two national commercial-free BBC networks, BBC 1 and BBC 2, • commercial ITV 1, Channel 4 and Channel 5 services. . The BBC channels are commercial-free while the other three have commercials. All the channels offer a mixture of drama, light entertainment, films, sport, educa­ tional, children’s and religious programmes, news and current affairs, or documen­ taries. The BBC has been providing regular television broadcasts since 1936. BBC television productions come from main studios at the Television Centre in west Lon­ don and other studios in various parts of London. ITV 1 is the most popular commercial television channel in Britain, watched on average by 45 million people every week. Radio People in Britain listen to an average 15 hours and 50 minutes of radio each week. The BBC has five national radio networks which together transmit all types of music, news, current affairs, drama, education, sport and a range of feature programmes. There are also 39 BBC local radio stations, and national radio services in Scotland, Wales and Northern Ireland.