The action against FremantleMedia is listed as dealing with data protection. No other details have been given.
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Last November, he admitted making "disrespectful comments" about two contestants during filming in 2020. He apologised and said that the remarks "were never intended to be shared".
The Guardian reported that a leaked transcript seen by the newspaper showed he had made derogatory and sexually explicit remarks about contestants during the recording of an episode of the talent show in January 2020.
Are the two linked? Presumably a leaked recording could be a data protection issue... If so, it'd be a bit cheeky suing over the thing that got you sacked but his lawyers clearly have an angle of attack they think will work (or get settled out of court).
It's funny because he has made a career out of being rude to people (and writing kid's books) and that is why he got hired for the show (I assume - I don't watch it, so he could be handing out advice on how to break into children's publishing). So sacking him for it seems a little... rude.