Britain's communications regulator revoked the U.K. broadcasting license of Iran's state-owned Press TV on Friday and demanded the Tehran-based English-language news channel leave the British airwaves immediately.

The decision stemmed from a complaint filed by Newsweek journalist Maziar Bahari against Press TV after the channel aired a 2009 false confession Mr. Bahari said he gave under duress during detention in an Iranian prison. The footage—in which Mr. Bahari confessed to helping stage Iran's 2009 protests with other...