I reckon the authorities over there are a pretty sick and tired by now of the cost and damage related to protests - particularly those that have the slightest chance of escalating... With respect to 'right to protest peacefully', the serial pests will treated with a no-tolerance order I'd imagine.
http://www.guardian.co.uk/uk/2011/oct/24/england-riots-cost-police-report Cost of English riots much higher than first thought, Met police report suggests. Initial findings of Metropolitan police review put claims for loss and damage in London alone as high as £300m
Then from the previous year 2010-2011:- The report reveals a total of £34.8m was spent policing 42 major public order events between April 2010 and March 2011. (http://www.bbc.co.uk/news/uk-england-london-14267274)
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