The Lib Dem MP Julian Huppert has tweeted that the Queen guitarist Brian May is in the Commons to hear the Environment Secretary's statement on delaying the badger cull.
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Vernon Unsworth sued the Tesla co-founder after comments made during a Twitter spat.
The Tory and Labour leaders appeared before a live studio audience in Maidstone in a debate hosted by the BBC.
Vernon Unsworth is suing Mr Musk for defamation.