Individuals arrested or subjected to police searches on the eve of the royal wedding are to challenge the legality of the policing ahead of William and Kate's nuptials last year at the High Court.
As another major royal event - the Queen's Diamond Jubilee - fast approaches, the police are being accused of operating an unlawful policy of stopping, searching and arresting those with "anti-monarchist" views.
The challenge is being heard by Lord Justice Richards and Mr Justice Openshaw sitting at the High Court in London.
Metropolitan Police lawyers are expected to argue there is no evidence that an unlawful policy was in operation on Friday April 29, 2011 when Prince William married Kate Middleton.
They will contend police activities were aimed at preventing criminal conduct, not preventing lawful protest.
The Met is expected to point out that several anti-royal protests took place in central London which were peaceful and the police did not intervene.
Prince William and Kate Middleton married in April 2011
The application for judicial review is being brought by some 20 individuals who were arrested on the wedding day, or were subjected to searches on days leading up to it.
Two of the applicants, Theodora Middleton and Dafydd Lewis, had their possessions searched when police officers raided their homes at Sipson Camp, a squatters' site named Grow Heathrow in West Drayton, Uxbridge, west London.
The camp was initially set up to oppose the building of a new runway at Heathrow Airport but later turned into a community garden and climate change campaign centre.
Lawyers for Ms Middleton and Mr Lewis argue that the searches constituted an "unlawful interference" with their right to respect for their homes and private life under human rights legislation. They are also challenging the legality of a decision by Bromley magistrates to grant the police a search warrant.
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PA/The Huffington Post UK | Posted: 28/05/2012 08:48 Updated: 28/05/2012 10:21