Radio's Gaunt loses his appeal over 'Nazi' jibe
Gaunt's contract was terminated by TalkSport in November 2008, ten days after an exchange with councillor Michael Stark.
During a hearing last month, the Court of Appeal was told his live interview with Mr Stark about Redbridge Council's decision to ban smokers from becoming foster parents - for which he later apologised - drew 53 complaints from listeners.
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Hide AdMr Stark said the welfare of children should outweigh the needs of foster families but Gaunt, who was himself in care, accused the councillor of being a "Nazi", a "health Nazi" and an "ignorant pig".
Last summer, Gaunt challenged Ofcom's June 2009 finding that he had failed to comply with the broadcasting code but the High Court backed Ofcom.
Three Court of Appeal judges rejected his appeal against the High Court decision.
Lord Neuberger said freedom of expression had been described as "the lifeblood of democracy". But he added: "However, freedom of expression carries with it responsibilities which themselves reflect the power of words, spoken or written."