The Duke of Cambridge has arrived at the King Edward VII Hospital in central London to visit his pregnant wife, who is being treated for severe morning sickness.
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Police were called to a fight between two groups of people on the petrol station forecourt at Cobham services.
The barriers are part of a series of measures put in place by the Metropolitan Police.
Resident group Justice 4 Grenfell say they were not consulted and will raise concerns about the appointment at the highest level.