Relatives of Kate and Gerry McCann are expected to give evidence at the libel trial of Portuguese police chief Goncalo Amaral.
Mr McCann's cousin Michael Wright is expected to be among those giving evidence relating to the "damage" caused by Mr Amaral's book.
Private investigator Dave Edgar, who assisted with the search for the missing child, is also part of proceedings.
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Hunt accused companies of "turning a blind eye" to a generation of children "exposed to harmful emotional side effects" of social media.
Top temperature 24C/75F.