Freedom to demonstrate yet restrictment of movement

I came across this little howler today whilst doing my usual rounds.

Climate Protestors finally revealed that the climate camp is to be set up in Central London to make the general public more aware of carbon emissions created by the City.
news.sky.com... 908415368679?lpos=UK_News_Carousel_Region_4&lid=ARTICLE_15368679_Climate_Camp_Secret_Location_Still_A_Secret_As_Protesters_Plan_To_Demonstrate_Against _Govt_Policy


However as people were making their way down to London knowing the whereabouts of the camp, the M25 was suddenly shut both ways due to a "gas leak" causing massive tailbacks and no-doubt having to send demonstrators into Central London where they will be tagged and charged for driving into the City Centre. This is yet again more proof of Big Brother Britain at work.