Security around an experimental crop in a Hertfordshire field has been stepped up to prevent any damage during a day of action by campaigners.
Those protesting against the genetically modified wheat are being kept away from the Harpenden test site, run by Rothamsted Research.
They are concerned about potential contamination from the cereal:
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Uber's chief executive Dara Khosrowshahi said the company "got things wrong".
Together the deal achieved more than £3,200 per square foot.
The man was taken early this morning to a south London police station where he remains in custody.