A court challenge has been launched to the legality of the policing of the royal wedding.
The Metropolitan Police are being accused of operating an unlawful policy of pre-emptively stopping, searching and arresting those who were viewed by officers as being likely to express "anti-monarchist" views.
It is being alleged the police acted without proper regard for the lawful pre-conditions for taking such action.
Some four test cases have come before the High Court in London for a preliminary hearing.
They involve individuals who were arrested on April 29, the day Prince William married Kate Middleton.
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Lord Justice Elias and Mr Justice King are being asked to decide how the case should proceed to a full hearing.