The disruption that Haw's protest is alleged to have caused led Parliament to insert a clause into the Serious Organised Crime and Police Act 2005 making it illegal to have protests in Parliament Square (or, indeed, in a large area reaching roughly half a mile in all directions) without first seeking the permission of the Metropolitan Police Commissioner.
SOCPA also amended the Protection from Harassment Act 1997 so that "pursuing a course of conduct" amounting to harassment could mean approaching two people just once, rather than one person at least twice, as before.
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Although the Kew Constabulary were a separate organisation to the Royal Parks Constabulary, they had police powers in the Royal Parks until the original Parks Regulations 1872 were amended by Section 162 of the Serious Organised Crime and Police Act 2005.