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It was developed by them for public use before the Second World War. Many programmes were broadcast by the BBC up until the outbreak of the war. The service, however, was stopped by them during the war. Many TV sets had been purchased by people by the beginning of the 1950s. The number of TV channels was increased by the authorities until there were two BBC channels and two commercial channels. Colour television was also developed by scientists. The BBC channels are paid by people by a licence fee. People who have not paid for the licence are detected by special radar vans. Satellite programmes have been started by international companies recently.